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 co,,only known facts. You have to decide which of the given conclusions, if any follow(s) from the given statements. Statement 1 : All wax are crayons. Statement 2: Some wax are pastels. Conclusion I: Some pastels are crayons. Conclusion II: All crayons are pastels.
Only conclusion I follows
Understanding Syllogism: Statements and Conclusions
This question asks us to analyze two logic statements and determine which of the given conclusions logically follow from them. This type of problem is common in logical reasoning tests and involves understanding the relationship between different categories based on the given statements. We must treat the statements as true, even if they contradict general knowledge.
Analyzing the Given Syllogism Statements
We are given the following statements:
- Statement 1: All wax are crayons.
- Statement 2: Some wax are pastels.
Let's break down what each statement tells us:
- Statement 1 is a universal affirmative statement. It means that the entire set of 'wax' is included within the set of 'crayons'. There is no wax that is not a crayon.
- Statement 2 is a particular affirmative statement. It means that there is at least one element in the set of 'wax' that is also in the set of 'pastels'. There is an overlap between the sets of 'wax' and 'pastels'.
Visualizing the Statements with Venn Diagrams
While we don't need to draw the diagrams, we can mentally visualize or describe the relationships between the categories (Wax, Crayons, Pastels) using Venn diagrams:
- Draw a circle representing 'Wax'.
- According to Statement 1, the entire 'Wax' circle is inside a larger circle representing 'Crayons'.
- According to Statement 2, the 'Wax' circle and the 'Pastels' circle overlap. Since the 'Wax' circle is inside the 'Crayons' circle, the portion of 'Wax' that overlaps with 'Pastels' must also be inside the 'Crayons' circle.
This visualization shows that the area where 'Wax' and 'Pastels' overlap is necessarily also within the 'Crayons' area. This indicates a relationship between 'Pastels' and 'Crayons'.
Evaluating Each Conclusion based on the Statements
Now let's evaluate each conclusion to see if it is supported by the given statements.
Conclusion I: Some pastels are crayons.
Statement 2 says "Some wax are pastels". Let's call this group of overlapping items X. So, X are wax and X are pastels. Statement 1 says "All wax are crayons". Since X are wax, it must be true that X are also crayons. Therefore, X are pastels and X are crayons. This means there is an overlap between pastels and crayons. Specifically, the group of items X represents 'some pastels' (because they are part of the pastels set) that are also 'crayons' (because they are part of the crayons set). Thus, this conclusion logically follows from the statements.
Conclusion II: All crayons are pastels.
This would mean the entire set of 'crayons' is contained within the set of 'pastels'. The statements only tell us about the relationship of 'wax' to 'crayons' and 'pastels'. We know all wax are crayons, and some wax are pastels. But there might be many crayons that are not wax. The statements provide no information about whether these non-wax crayons are pastels or not. Even the crayons that are wax might not all be pastels (only *some* wax are pastels). Therefore, we cannot conclude that all crayons are pastels. This conclusion does not follow.
Conclusion III: No crayons are pastels.
This conclusion states that the sets of 'crayons' and 'pastels' have no overlap. However, our analysis of Conclusion I showed that because some wax are pastels (Statement 2) and all wax are crayons (Statement 1), the group of items that are both wax and pastels must also be crayons. This proves there is an overlap between pastels and crayons (specifically, the items that are both wax and pastels). Therefore, it is not true that no crayons are pastels. This conclusion contradicts the logical consequence of the statements and thus does not follow.
Summary of Conclusions
Based on our analysis:
- Conclusion I (Some pastels are crayons) follows.
- Conclusion II (All crayons are pastels) does not follow.
- Conclusion III (No crayons are pastels) does not follow.
Therefore, only Conclusion I follows from the given statements.
| Conclusion | Analysis | Follows? |
|---|---|---|
| I: Some pastels are crayons. | Some Wax are Pastels (Statement 2), and All Wax are Crayons (Statement 1). The Wax that are Pastels are also Crayons. | Yes |
| II: All crayons are pastels. | Statements don't provide enough information about all crayons, only about wax that are crayons. | No |
| III: No crayons are pastels. | Contradicts Conclusion I, which is shown to follow. There is an overlap between crayons and pastels. | No |
Revision Table: Key Syllogism Concepts
| Term | Description |
|---|---|
| Syllogism | A form of logical reasoning where a conclusion is drawn from two given or assumed propositions (statements). |
| Statement | A proposition accepted as true for the purpose of the argument. Classified as Universal Affirmative (All A are B), Universal Negative (No A are B), Particular Affirmative (Some A are B), Particular Negative (Some A are not B). |
| Conclusion | The proposition that is inferred or derived from the statements. Must logically follow from the statements. |
| Follows | A conclusion 'follows' if it is necessarily true whenever the statements are true. |
Additional Information on Syllogism and Logic
Syllogism problems test your ability to apply deductive reasoning. You start with general statements (premises) and deduce a specific conclusion. It's crucial to rely only on the information provided in the statements, not on outside knowledge.
Common pitfalls include making assumptions that are not supported by the statements, confusing "some" with "all", or confusing "some are not" with "none".
Venn diagrams are a very helpful tool for visualizing the relationships between the categories in syllogism problems. They can make it easier to see which areas must overlap or be contained within others, and thus determine whether a conclusion is valid.
In this specific problem, the structure is similar to a standard form where we have a middle term ('wax') connecting two other terms ('crayons' and 'pastels').
- Statement 1: All M are P (All Wax are Crayons) - Rephrased P is predicate, M is middle term. Should be All M are P, All Wax are Crayons. Let M=Wax, P=Crayons. Statement 1: All M are P.
- Statement 2: Some M are S (Some Wax are Pastels) - Let S=Pastels. Statement 2: Some M are S.
- Conclusion I: Some S are P (Some Pastels are Crayons)
This pattern (All M are P, Some M are S → Some S are P) is a valid form in traditional syllogism rules (specifically, it's related to Darapti or Disamis forms under certain interpretations/diagrams, or simply follows from the set relationships). The overlap required by "Some M are S" combined with "All M are P" forces an overlap between S and P.
Important Questions from Syllogism
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:
All dancers are talented.
Some girls are dancers.
Conclusions:
I. Some girls are talented.
II. All talented are girls.
III. All girls are talented.
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:
All directors are actors.
No actor is a producer.
All choreographers are directors.
Conclusions:
I. No choreographer is producer.
II. Some actors are choreographers.
III. No director is a producer.
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 follows from the statements.
Statements:
All lemons are plums.
All plums are dates.
Some dates are mangoes.
Conclusions:
I. Some lemons are mangoes.
II. Some mangoes are plums.
III. All lemons are dates.
IV. Some mangoes are dates.
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 cards are postcards.
Some cards are envelopes.
All envelopes are copies.
Conclusions:
I. Some copies are envelopes.
II. Some postcards are copies.
III. Some cards are copies.
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:
All employees are tax-payers.
Some employees are farmers.
Some farmers are doctors.
Conclusions:
I. No farmer is a tax-payer.
II. Some farmers are tax-payers.
