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In the binomial expansion of (a+b)^n , c...

In the binomial expansion of `(a+b)^n` , coefficients of the fourth and thirteenth terms are equal to each other. Find `n` .

Text Solution

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The correct Answer is:
`n=15`
`T_(r+1) =.^(n)C_(r)a^(n-r)* b^(r).`
Coeff. Of `T_(4) = " coeff. of " T_13 rArr .^(n) C_(3) = .^(n)C_(12) rArr (3+12)= n rArr n = 15.`
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