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

Answer and explanation

Correct answer: 1260

The governing concept is the permutation of objects with repeated elements. BALLOON has seven letters: B, A, L, L, O, O, N. If all seven letters were different, the number of arrangements would be 7!. However, the two Ls are identical, so each distinct arrangement is counted 2! times in that total. The two Os are also identical and require division by another 2!. Therefore the number of distinct arrangements is 7!/(2! × 2!) = 5040/(2 × 2) = 1260. Hence option A is correct. Option C is simply 7! and fails to correct for either repeated pair. Option B divides by only one 2!, so it corrects for one repeated letter but not the other. Option D divides by an unnecessary additional factor and undercounts the arrangements.

Related tags

PermutationsRepeated LettersDistinct ArrangementsClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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