1.

Find the coefficient of x7 in (ax2+1bx) and x−7 in (ax−1bx2) and find the relation between a and b, so that these coefficients are equal. Or In the binomial expansion of (1+x)n, the coefficients of the fifth, sixth and seventh terms are in AP. Find all values of n for which this can happen.

Answer» Find the coefficient of x7 in (ax2+1bx) and x7 in (ax1bx2) and find the relation between a and b, so that these coefficients are equal.

Or

In the binomial expansion of (1+x)n, the coefficients of the fifth, sixth and seventh terms are in AP. Find all values of n for which this can happen.


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