The statements below are followed by two conclusions labeled I and II. Assuming that the information in the statements is true, even if it appears to be at variance with generally established facts, decide which conclusion(s) logically and definitely follow(s) from the information given in the statements. Statements: 1) All butterflies are reptiles. 2) All reptiles are mammals. Conclusion: I. All mammals are butterflies.
Only conclusion II follows.
Understanding Syllogism Statements and Conclusions
This question asks us to analyze given statements and determine which of the provided conclusions logically follow. This type of problem is known as a syllogism in logical reasoning. We must strictly adhere to the information given in the statements, even if it contradicts real-world knowledge.
Analyzing the Statements
We have two statements:
- All butterflies are reptiles.
- All reptiles are mammals.
Let's represent these relationships:
- Statement 1: If something is a butterfly, then it is a reptile. (Butterflies $\rightarrow$ Reptiles)
- Statement 2: If something is a reptile, then it is a mammal. (Reptiles $\rightarrow$ Mammals)
Combining the Statements
We can combine these two statements. If all butterflies belong to the set of reptiles, and all reptiles belong to the set of mammals, then it must be true that all butterflies also belong to the set of mammals.
Think of it like sets:
- The set of Butterflies is entirely inside the set of Reptiles.
- The set of Reptiles is entirely inside the set of Mammals.
This implies that the set of Butterflies is entirely inside the set of Mammals.
So, from the statements, we can logically deduce: All butterflies are mammals.
Evaluating the Conclusions
Now let's look at the given conclusions:
Conclusion I: All mammals are butterflies.
Based on our deduction that all butterflies are mammals, does it mean all mammals are butterflies? Not necessarily. The combined statements tell us that the set of butterflies is a subset of the set of mammals. There might be many mammals that are not reptiles (and thus not butterflies). For example, based on the statements, a cow could be a mammal, but it doesn't have to be a reptile or a butterfly.
Therefore, Conclusion I does not logically follow from the given statements.
Conclusion II: All butterflies are mammals.
As we deduced from combining Statement 1 (All butterflies are reptiles) and Statement 2 (All reptiles are mammals), this conclusion logically and definitely follows.
If every single butterfly is a reptile, and every single reptile is a mammal, then it is unavoidable that every single butterfly is also a mammal.
Therefore, Conclusion II logically follows from the given statements.
Final Decision
Based on the analysis, only Conclusion II logically follows from the statements.
The correct option is the one stating that only conclusion II follows.
Revision Table: Syllogism Analysis
| Statement/Conclusion | Relationship | Logical Follows? | Explanation |
|---|---|---|---|
| Statement 1 | All Butterflies $\rightarrow$ Reptiles | Given | Accepted as true. |
| Statement 2 | All Reptiles $\rightarrow$ Mammals | Given | Accepted as true. |
| Combined Logic | All Butterflies $\rightarrow$ Mammals | Yes | Derived from Statement 1 and 2. |
| Conclusion I | All Mammals $\rightarrow$ Butterflies | No | Converse is not necessarily true. Mammals could exist that are not Butterflies. |
| Conclusion II | All Butterflies $\rightarrow$ Mammals | Yes | Directly follows from the combined logic of statements 1 and 2. |
Additional Information: Basics of Syllogisms
Syllogisms are a form of logical argument that apply deductive reasoning to arrive at a conclusion based on two or more propositions that are asserted or assumed to be true. The structure is typically: Major Premise, Minor Premise, Conclusion.
Key principles in syllogisms like this:
- All A are B: This means the set of A is a subset of the set of B. It does NOT mean All B are A.
- Chain Rule: If All A are B, and All B are C, then it logically follows that All A are C. (This is what we saw with Butterflies, Reptiles, and Mammals).
- Assumption of Truth: In syllogism problems, you must assume the statements are true, regardless of real-world facts.
Understanding these basic rules helps in correctly determining which conclusions are logically valid deductions from the given statements.
Important Questions from Syllogism
The statements below are followed by conclusions labeled I, II and III. Assuming that the information in the statements is true, even if it appears to be at variance with generally established facts, decide which conclusion(s) logically and definitely follow(s) from the information given in the statements.
Statements:
All twenty are thirty.
All thirty are forty.
All forty are sixty.
All sixty are seventy.
Conclusions:
I. Some forty are thirty.
II. Some seventy are sixty.
III. No thirty is twenty.The statements below are followed by two conclusions labelled I and II. Assuming that the information in the statements is true, even if it appears to be at variance with generally established facts, decide which conclusion(s) logically and definitely follow(s) from the information given in the statements.
Statements:
All Strong are animals.
Some animals are Tigers.
All Tigers are Sharp.
Conclusions:
I. Some Strong are Sharp.
II. No Strong is Sharp.The statements below are followed by conclusions labelled I, II and III. Assuming that the information in the statements is true, even if it appears to be at variance with generally established facts, decide which conclusion(s) logically and definitely follow(s) from the information given in the statements.Statements:
Some women are weak.
Some weaks are female.
All female are iron.
All iron are gold.Conclusions:
I. Some weaks are iron.
II. Some gold are weaks.
III. Some women are female.
The statements below are followed by two conclusions labeled I and II. Assuming that the information in the statements is true, even if it appears to be at variance with generally established facts, decide which conclusion(s) logically and definitely follow(s) from the information given in the statements.Statements:
Some teaspoons are glasses.
All teddies are teaspoons.
Conclusions:
I. Some teddies are glasses.
II. Some glasses are teddies.
The statements below are followed by two conclusions labeled I and II. Assuming that the information in the statements is true, even if it appears to be at variance with generally Established facts, decide which conclusion(s) logically and definitely follow(s) from the Information, Given in the Statements.
Statements:
All bangles are rings.
Some rings are toys.
Some toys are dolls.
Conclusions:
I. Some rings are bangles.
II. Some dolls are rings.
