Three statements are given followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements. Statements: No rain is an earthquake. All rains are floods. Some rains are droughts. Conclusions: I. Some floods are earthquakes. II. Some droughts are earthquakes. III. Some floods are droughts.
Only conclusion III follows
Understanding Logic Statements and Conclusions
This question asks us to analyze a set of statements and determine which of the given conclusions logically follow from them. This type of problem tests our ability to perform logical deduction based on the relationships described in the statements, even if those relationships contradict common knowledge.
Analyzing the Given Statements
We have three statements:
- Statement 1: No rain is an earthquake.
- Statement 2: All rains are floods.
- Statement 3: Some rains are droughts.
These statements establish relationships between the categories: Rain, Earthquake, Flood, and Drought. To solve this, we can visualize these relationships, often using Venn Diagrams.
Visualizing with Venn Diagrams
Let's represent each category with a circle. The statements define how these circles overlap or stay separate:
- Statement 1 tells us the 'Rain' circle and the 'Earthquake' circle have absolutely no overlap. They are separate.
- Statement 2 tells us the entire 'Rain' circle is contained within the 'Flood' circle. Every rain event is also a flood.
- Statement 3 tells us that the 'Rain' circle and the 'Drought' circle have some area of overlap. There are some events that are both rain and drought (within the context of the statements).
Combining these, the 'Rain' circle is inside 'Flood', 'Rain' overlaps with 'Drought', and 'Rain' is separate from 'Earthquake'.
Evaluating the Conclusions
Now let's check each conclusion based on our understanding from the statements and visualization.
Conclusion I: Some floods are earthquakes.
From the statements, we know 'All rains are floods' and 'No rain is an earthquake'. This means the part of the 'Flood' circle that is also 'Rain' cannot be 'Earthquake'. However, the 'Flood' circle might contain areas that are not 'Rain'. The statements provide no information about the relationship between these 'non-rain floods' and 'Earthquakes'. Therefore, we cannot definitively conclude that 'Some floods are earthquakes'. This conclusion does not logically follow.
Conclusion II: Some droughts are earthquakes.
We know 'Some rains are droughts' and 'No rain is an earthquake'. This tells us that the part of 'Drought' that is also 'Rain' is definitely not 'Earthquake'. The statements give us no information about the relationship between the part of 'Drought' that is NOT 'Rain' and 'Earthquake'. We cannot conclude whether there is any overlap between 'Drought' and 'Earthquake'. Therefore, 'Some droughts are earthquakes' does not logically follow.
Conclusion III: Some floods are droughts.
Consider Statement 3: 'Some rains are droughts'. This means there is an overlap between the 'Rain' and 'Drought' categories. Now consider Statement 2: 'All rains are floods'. This means the entire 'Rain' category is contained within the 'Flood' category. If there are some events that are both 'Rain' and 'Drought', and all 'Rain' events are also 'Flood' events, then those events that are both 'Rain' and 'Drought' must also be 'Flood' events. This means there is an overlap between the 'Flood' and 'Drought' categories. Specifically, the portion of 'Rain' that is also 'Drought' is necessarily also 'Flood'. Thus, 'Some floods are droughts' logically follows from the statements.
Summary of Conclusions
Based on our analysis:
- Conclusion I: Some floods are earthquakes - Does not follow.
- Conclusion II: Some droughts are earthquakes - Does not follow.
- Conclusion III: Some floods are droughts - Follows.
Therefore, only Conclusion III logically follows from the given statements.
| Conclusion | Logically Follows? | Reasoning |
|---|---|---|
| I. Some floods are earthquakes. | No | Statements don't provide a necessary link between Floods (outside of Rain) and Earthquakes. |
| II. Some droughts are earthquakes. | No | Statements don't provide a necessary link between Droughts (outside of Rain) and Earthquakes. |
| III. Some floods are droughts. | Yes | Since some rains are droughts, and all rains are floods, the rains that are droughts must also be floods. |
Revision Table: Logic Statements and Conclusions
Understanding the different types of statements in logic problems is crucial:
- Universal Affirmative (All A are B): The entire set A is contained within set B.
- Universal Negative (No A is B): Set A and Set B are completely separate.
- Particular Affirmative (Some A are B): Sets A and B have at least one element in common (they overlap).
- Particular Negative (Some A are not B): There is at least one element in set A that is not in set B.
Analyzing how these types of statements combine helps determine valid conclusions.
Additional Information: Solving Syllogism Problems
Syllogism is a type of logical argument where a conclusion is derived from two or more propositions (statements). While Venn Diagrams are a popular visual method, you can also use rules of inference or symbolic logic to solve these problems. The key is to identify what relationships are guaranteed by the statements and avoid making assumptions about relationships that are not explicitly stated or necessarily implied.
Always assume the given statements are true, regardless of whether they align with real-world facts, and check only if the conclusions must be true based solely on those statements.
Similar Questions
Two statements are given, followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
All teachers are engineers.
All clerks are teachers.
Conclusions:
I. Some engineers are clerks.
II. Some teachers are clerks.
III. Some clerks are not engineers.
Two statements are given followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
All keys are locks.
All locks are handles.
Conclusions:
I. Some locks are keys.
II. Some handles are keys.
Three Statements are given followed by Three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
All switches are fans.
No heater is a fan.
Some wires are heaters.
Conclusions:
I. Some wires are fans.
II. No switch is a heater.
III. No wire is a switch.
Three statements are given followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
All H are G.
All V are H.
Some V are I.
Conclusions:
I. At least some G are I.
II. All I being H is a possibility.
Three Statements are given followed by Three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements :
Some beds are chairs.
Some chairs are tables.
All tables are cupboards.
Conclusions :
I. Some tables are beds.
II. Some cupboards are chairs.
III. Some cupboards are beds.
Read the given statement(s) and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statement(s).
Statements :
Some ceilings are beds.
No bed is an apple.
All dogs are beds.
Conclusions :
I. Some ceilings being dogs is a possibility.
II. No dog is an apple.
III. All beds are dogs.
IV. No ceiling is an apple.
Two statements are given followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements :
All keys are locks.
All locks are handles.
Conclusions :
I. Some locks are keys.
II. All handles are keys.
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.
Statements:
Some fans are hammers.
All hammers are fishes.
Conclusions:
I. No fans are fishes.
II. Some fans are fishes.
Three statements are given, followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
All classrooms are schools.
No school is a park.
All houses are parks.
Conclusions:
I. No house is a classroom.
II. No park is a classroom.
III. No school is a house.
Read the given statements and conclusions carefully. Assuming that the information given in the statement is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.
Statements:
Some fans are coolers.
All coolers are equipment.
Some equipment are mobiles.
Conclusions:
I. Some equipments are fans.
II. Some mobiles are fans.
III. No equipment is fan and cooler both
Important Questions from Conventional Syllogism
In this question, three statements followed by two conclusions numbered I and II have been given. You have to take the given statements to be true even if they seem to be at variance from the commonly facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.
Statements: Some flats are apartments.
No apartment is a hall.
Some halls are rooms.
Conclusions: I. At least some rooms are flats.
II. No apartment is a room.
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.
Statements:
I. Some blue are red.
II. Some green are red.
Conclusions:
I. No blue is green.
II. No red is green.
Given below are two statements, Consider these statements to be true even if they seem factuality absurd, Read the conclusions and then decide which of the given conclusions logically follow(s) from the given statements?
Statements :
1. All vases are flowers.
2. No flowers is a plant.
Conclusions :
1. No vases is a plant.
2. Some plant are vases
In the question two statements are given, followed by three conclusions, I, II and III. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.
Statement 1 : Some cars are scooters.
Statement 2 : All scooters are buses.
Conclusion I : Some scooters are cars.
Conclusion II : Some buses are cars.
Conclusion III : All cars are buses.
In the question below are given three statements followed by two conclusions. You have to take each of the given statements to be true. Read the conclusions and then decide which of the conclusions can be logically derived.
Statements:
Some schools are colleges.
No college is university.
All universities are hospitals.
Conclusions:
I. Some schools are universities.
II. At least some hospitals are colleges.
