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How many distinct arrangements are possible using the letters of ASSASSIN?

Answer and explanation

Correct answer: 840

The governing rule is the permutation formula for objects with repetitions. ASSASSIN contains 8 letters: A occurs 2 times, S occurs 4 times, and I and N occur once each. Starting with 8! arrangements would temporarily treat equal letters as distinguishable. However, exchanging the two As changes nothing, so divide by 2!, and exchanging the four Ss also changes nothing, so divide by 4!. Thus the number of distinct arrangements is 8!/(2! × 4!) = 40,320/(2 × 24) = 40,320/48 = 840. Therefore option B is correct. Option A usually comes from forgetting the repeated As, while C and D use incorrect repetition adjustments.

Related tags

PermutationsRepeated LettersFrequency FormulaPermutations And CombinationsMathematicsClass 11 Mcq

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