JEE Main · 2023 · 01 Feb 2023 · Shift 2 · Mathematical Reasoning *

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Which of the following statements is a tautology ?
  1. (A)
  2. (B)✓ Correct
  3. (C)
  4. (D)

Answer: (B)

Solution

Using , the compound statement becomes . Regrouping, , true under every assignment. The other three expressions simplify to , and , none of which is always true. Hence the tautology is .

JEE Main · 2023 · 01 Feb 2023 · Shift 2 · Single correct option

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