NDA 2026 · PYQ · Probability / Set Theory of Events · medium
Consider the following statements in respect of the events A, B, C:
I. (A ∪ B ∪ C) ∩ (Ā ∩ B̄ ∩ C̄) is an impossible event.
II. (A ∩ B ∩ C) ∩ (Ā ∪ B̄ ∪ C̄) is a possible event.
Which of the statements given above is/are correct?
A.I only✓ Correct
B.II only
C.Both I and II
D.Neither I nor II
Explanation
Statement I: (A ∪ B ∪ C) ∩ (Ā ∩ B̄ ∩ C̄) = (A ∪ B ∪ C) ∩ (A ∪ B ∪ C)' by De Morgan's law, which equals the empty set (impossible event). So I is correct. Statement II: (A ∩ B ∩ C) ∩ (Ā ∪ B̄ ∪ C̄) = (A ∩ B ∩ C) ∩ (A ∩ B ∩ C)' by De Morgan's law, which is also the empty set (impossible, not possible). So II is incorrect. Only statement I is correct.
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