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 houses are trees. All flowers are houses. No vegetable is a flower. Conclusions: (I) Some vegetables are houses is a possibility. (II) Some flowers are trees is a possibility. (III) No vegetable is a house.
Both conclusions I and II follow
Understanding Syllogism Statements and Conclusions
This question asks us to analyze a set of statements and determine which of the given conclusions logically follow from them. We need to assume the statements are true, even if they contradict common knowledge. This type of problem is based on logical deduction, often visualized using Venn diagrams.
Analyzing the Syllogism Statements
Let's break down the given statements:
- Statement 1: Some houses are trees. (Relationship between Houses and Trees)
- Statement 2: All flowers are houses. (Relationship between Flowers and Houses)
- Statement 3: No vegetable is a flower. (Relationship between Vegetables and Flowers)
We can represent these relationships mentally or with diagrams. Statement 2 tells us that the entire group of flowers is contained within the group of houses. Statement 1 tells us there is at least one house that is also a tree. Statement 3 tells us there is no overlap between the group of vegetables and the group of flowers.
Evaluating the Conclusions
Now, let's evaluate each conclusion based on the statements. We need to see if the conclusion *must* be true or *could possibly* be true (if it's a possibility conclusion) based on the statements.
Conclusion (I): Some vegetables are houses is a possibility.
From Statement 2, we know that all flowers are houses. From Statement 3, we know that no vegetable is a flower. This means vegetables cannot be in the part of houses that consists of flowers. However, houses can include things other than flowers. The statements do not restrict vegetables from overlapping with the part of houses that are *not* flowers. Therefore, it is possible that some vegetables are houses. This conclusion logically follows as a possibility.
Conclusion (II): Some flowers are trees is a possibility.
From Statement 2, all flowers are houses. From Statement 1, some houses are trees. Since all flowers are inside the category of houses, and some houses overlap with trees, it is possible that the houses which overlap with trees also include some of the flowers. The statements do not prevent this overlap between flowers and trees. Therefore, it is possible that some flowers are trees. This conclusion logically follows as a possibility.
Conclusion (III): No vegetable is a house.
From Statement 2, all flowers are houses. From Statement 3, no vegetable is a flower. As discussed for Conclusion (I), while vegetables cannot be in the 'flower' part of houses, they *could* be in the 'non-flower' part of houses. Since it is possible for some vegetables to be houses (Conclusion I), the definite statement "No vegetable is a house" is not necessarily true. It does not logically follow from the statements. In fact, the possibility in Conclusion I contradicts this definite conclusion.
Summary of Conclusion Analysis
| Conclusion | Analysis | Follows? |
|---|---|---|
| (I) Some vegetables are houses is a possibility. | Vegetables cannot overlap with the 'flower' part of houses, but can overlap with the 'non-flower' part of houses. | Yes (as a possibility) |
| (II) Some flowers are trees is a possibility. | Flowers are inside houses. Some houses overlap with trees. The overlap of houses and trees could include flowers. | Yes (as a possibility) |
| (III) No vegetable is a house. | It is possible for some vegetables to be in the 'non-flower' part of houses. This contradicts 'No vegetable is a house'. | No |
Based on the analysis, both Conclusion (I) and Conclusion (II) logically follow as possibilities from the given statements.
Revision Table: Syllogism Rules and Terms
| Term/Rule | Description |
|---|---|
| Statement | A premise assumed to be true for the purpose of logical deduction. |
| Conclusion | A proposition that is inferred from the statements. |
| Follows Logically | The conclusion must be true if the statements are true. |
| Possibility | The conclusion *could* be true based on the statements, without contradicting any statement. |
| 'All' relation | One category is completely included in another (e.g., All F are H). |
| 'Some' relation | There is at least one member common to both categories (e.g., Some H are T). 'Some' implies 'at least one, possibly all'. |
| 'No' relation | There is no member common to both categories (e.g., No V is F). |
Additional Information on Logical Deduction
Logical deduction problems like this, often called syllogisms, test your ability to reason based purely on the information provided in the statements, ignoring outside knowledge. The key is to identify the relationships between different categories (houses, trees, flowers, vegetables) as described by the statements and then see what can be concluded or is possible based on those relationships.
Using Venn diagrams is a common technique to visualize these relationships. Each category is represented by a circle, and the overlap or separation of circles shows the relationship (All, Some, No). For 'possibility' conclusions, you need to explore different valid diagram configurations allowed by the statements and see if the situation described in the conclusion can occur in at least one of them without violating any statement.
In this problem, understanding the implications of "All flowers are houses" (Flowers are a subset of Houses) and "No vegetable is a flower" (Vegetables and Flowers are mutually exclusive) is crucial. When combined with "Some houses are trees", we can evaluate the possible overlaps or separations between all four categories.
Important Questions from Conventional 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:
1. Some flowers are chemicals.
2. Some chemicals are herbs.
Conclusions:
I. No flower is a herb.
II. Some flowers are herbs.
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 students are teachers.
All teachers are professors.
Conclusions:
1. All students are professors.
2. All professors are students.
3. No teacher is a professor.
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 dentists are surgeons.
II. All the surgeons are doctors.
Conclusions:
I. Some dentists are doctors.
II. No surgeons are dentists.
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 at variance with generally established facts. decide which conclusion(s) logically and definitely follow(s) from the information given in the statements.
Statements:
1) Some angers are griefs.
2) Some griefs are loves.
Conclusion:
I. Some griefs are angers.
II. Some loves are griefsThe 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 cows are deer.
Some deer are fishes.
Conclusion:
I. Some cows are fishes.
II. Some fishes are cows.
