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If ""^(n)C(4),^(n)C(5)" and "^(n)C(6) ar...

If `""^(n)C_(4),^(n)C_(5)" and "^(n)C_(6)` are in A.P. then find n.

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The correct Answer is:
n=14 or 7
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If ""^(n)C_(4)=""^(n)C_(6) find ""^(12)C_(n) .

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