IAS 2022 — CSAT Reasoning

2022mcqmedium

Two statements followed by four conclusions are given below. You have to take the Statements to be true even if they seem to be at variance from the commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows/follow the statements, disregarding the commonly known facts:

Statement-1: All pens are books.
Statement-2: No chair is a pen.
Conclusion-I: All chairs are books.
Conclusion-II: Some chars are pens.
Conclusion-III: All books are chairs.
Conclusion-IV: No chair is a book.
Which one of the following is correct?

Official previous-year question

Verified 2 Aug 2026.

Options

AOnly conclusion-I.
BOnly conclusion-II.
CBoth conclusion-III and conclusion-IV.
DNone of the conclusions follows.

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Solution

Correct Option (D)

The correct option is (D) None of the conclusions follows. This is determined by evaluating each conclusion against the given statements using principles of logical deduction, considering all possible valid interpretations of the relationships between the categories.

Incorrect Options:

To assess the conclusions, we interpret the statements:

Statement-1: All pens are books. (This implies that the set of pens is a subset of the set of books.)
Statement-2: No chair is a pen. (This implies that the set of chairs and the set of pens are mutually exclusive; they have no common elements.)

Based on these statements, we analyze each conclusion:

Conclusion-I: All chairs are books.

This conclusion does not logically follow. While chairs are distinct from pens, and pens are a subset of books, the relationship between chairs and books is not definitively established. Chairs could be entirely outside the set of books, or they could partially or entirely overlap with the set of books, provided they do not overlap with pens. Since there are valid scenarios where not all chairs are books, this conclusion is not logically derivable.
Conclusion-II: Some chairs are pens.

This conclusion directly contradicts Statement-2, which explicitly states, "No chair is a pen." Therefore, this conclusion is false.
Conclusion-III: All books are chairs.

This conclusion does not logically follow. If all books were chairs, then by Statement-1, all pens (which are books) would also necessarily be chairs. However, Statement-2 asserts that "No chair is a pen," meaning no pen can be a chair. This creates a contradiction. Hence, this conclusion is false.
Conclusion-IV: No chair is a book.

This conclusion does not logically follow. Similar to Conclusion-I, the relationship between chairs and books is not definitively established. Chairs could be entirely outside the set of books, or they could partially or entirely overlap with the set of books (excluding the pens within books). Since there are valid scenarios where some chairs are books, this conclusion is not logically derivable.

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Correct Option (D)

Incorrect Options:

To assess the conclusions, we interpret the statements:

Statement-1: All pens are books. (This implies that the set of pens is a subset of the set of books.)
Statement-2: No chair is a pen. (This implies that the set of chairs and the set of pens are mutually exclusive; they have no common elements.)

Based on these statements, we analyze each conclusion:

Conclusion-I: All chairs are books.

This conclusion does not logically follow. While chairs are distinct from pens, and pens are a subset of books, the relationship between chairs and books is not definitively established. Chairs could be entirely outside the set of books, or they could partially or entirely overlap with the set of books, provided they do not overlap with pens. Since there are valid scenarios where not all chairs are books, this conclusion is not logically derivable.
Conclusion-II: Some chairs are pens.

This conclusion directly contradicts Statement-2, which explicitly states, "No chair is a pen." Therefore, this conclusion is false.
Conclusion-III: All books are chairs.

This conclusion does not logically follow. If all books were chairs, then by Statement-1, all pens (which are books) would also necessarily be chairs. However, Statement-2 asserts that "No chair is a pen," meaning no pen can be a chair. This creates a contradiction. Hence, this conclusion is false.
Conclusion-IV: No chair is a book.

This conclusion does not logically follow. Similar to Conclusion-I, the relationship between chairs and books is not definitively established. Chairs could be entirely outside the set of books, or they could partially or entirely overlap with the set of books (excluding the pens within books). Since there are valid scenarios where some chairs are books, this conclusion is not logically derivable.

IAS 2022 — CSAT Reasoning

Options

Did you get this right?

Solution

Correct Option (D)

Incorrect Options:

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IAS 2022 — CSAT Reasoning

Options

Did you get this right?

Solution

Correct Option (D)

Incorrect Options:

Your note

IAS Reasoning in other years

More IAS Reasoning questions

Other CSAT topics for IAS

Comprehension

Maths

Keep practicing Reasoning