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How many distinct letter arrangements are possible for the word (APPLE)?

Answer and explanation

Correct answer: (60)

The direct answer is C: 60. APPLE has five positions, but P appears twice; the two P letters are identical and must not be counted as different. If temporarily treated as distinct, there are \(5!=120\) orders. Every actual arrangement is then counted \(2!\) times by exchanging the two P's, so the number is \(5!/2!=120/2=60\). Option C is correct. Option A, 120, overcounts by treating identical P's as different. Option B, 20, is too small and has no valid counting basis here. Option D, 30, also does not follow from the repetition formula. The useful rule is \(n!/(r_1!r_2!\cdots)\) for repeated letters.

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PermutationsClass11Easy

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