csatmedium

Examine the following statements:

  1. 1.All colours are pleasant.
  2. 2.Some colours are pleasant.
  3. 3.No colour is pleasant.
  4. 4.Some colours are not pleasant. Given that statement 4 is true, what can be definitely concluded?
  1. A.1 and 2 are true
  2. B.3 is true
  3. C.2 is false
  4. D.1 is false
▶ Answer & Explanation

Correct answer: D. 1 is false

If the statement 'Some colours are not pleasant' is true, it directly implies that the universal affirmative statement 'All colours are pleasant' cannot be true, because there exists at least one colour that is not pleasant. Therefore, statement 1 must be false. The truth value of other statements (2 and 3) cannot be definitively determined solely from statement 4.

Source: UPSC csat 2017

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