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

Answer and explanation

Correct answer: (3)

The direct answer is D: 3. EYE has three positions and E is repeated twice. Treating the two E's as temporarily different gives \(3!=6\) orders, but exchanging the identical E's does not create a new arrangement. Hence divide by \(2!\): \(3!/2!=6/2=3\). The actual arrangements are EYE, E EY? More clearly, the three patterns are EYE, E E Y, and Y E E, written as EYE, EEY and YEE. Option D is correct. Option A, 6, double-counts the identical E's. Option B, 2, misses one pattern. Option C, 1, treats all letters as if they were identical. A repeated letter is divided out, not ignored completely.

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PermutationsClass11Easy

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