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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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  14. If .^(n)C(r-1): .^(n)C(r): .^(n)C(r+1)=3:4:5, find the values of n and...

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  15. Prove that : (""^(n)C(r+1))/(""^(n)C(r))=(n-r)/(r+1)

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