1.

Find the sum of the coefficients of x5 and x7 in the expansion of the product (1+2x)6(1−x)7. Or Show that the middle term in the expansion of (1+2x)2n is 1.3.5...(2n−1)n!2n.xn.

Answer» Find the sum of the coefficients of x5 and x7 in the expansion of the product (1+2x)6(1x)7.

Or

Show that the middle term in the expansion of (1+2x)2n is 1.3.5...(2n1)n!2n.xn.


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