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Question

In how many ways can the letters of the word INSURANCE be arranged so that vowels are occupied at even places?

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Solution

INSURANCE has I, A, U, E as vowels and N, S, R, N, C as consonantsNow there will be nine place requirement for arranging them, _ _ _ __ _ _ _ _So there are 5 odd places and 4 even places.So at 4 even places 4 vowels can arrange them in 4! ways.And for the remaining 5 odd places 5 consonants can arrange there in,= 5!2! as Nis two timesSo total number of ways = 4!×5!2!=1440

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