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How many distinct arrangements are there for the word (NOON)?

Answer and explanation

Correct answer: (6)

The direct answer is B: 6. NOON contains four letters, with N repeated twice and O repeated twice. If all positions were different there would be \(4!=24\) orders. Swapping the two N's changes nothing, so divide by \(2!\); swapping the two O's also changes nothing, so divide by another \(2!\). Thus \(4!/(2!2!)=24/4=6\). Option B is correct. Option A, 12, divides by only one repeated pair. Option C, 4, divides too much or uses an incorrect count. Option D, 24, ignores both repetitions. The rule is to divide by the factorial of every repeated group.

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PermutationsClass11Easy

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