1.

The coefficients of 2nd, 3rd and 4th terms in the expansion of (1+x)2n are in A.P., show that 2n2−9n+7=0.

Answer»

The coefficients of 2nd, 3rd and 4th terms in the expansion of (1+x)2n are in A.P., show that 2n29n+7=0.



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