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

Answer and explanation

Correct answer: 50400

This is a permutation problem involving repeated letters. STATISTICS has 10 letters in total: S appears 3 times, T appears 3 times, I appears 2 times, and A and C appear once each. If every letter were treated as distinct, there would be 10! arrangements, but interchanging identical S, T, or I letters does not produce a new word arrangement. Therefore divide by the corresponding factorials: 10!/(3! × 3! × 2!) = 3,628,800/(6 × 6 × 2) = 3,628,800/72 = 50,400. Hence option A is correct. The other values result from ignoring one or more repeated-letter corrections and therefore overcount or miscount identical arrangements.

Related tags

PermutationsRepeated LettersWord ArrangementPermutations And CombinationsMathematicsClass 11 Mcq

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