1.

Find the coefficient of xn−2 in (nC0+nC1x+nC2x2.....nCnxn)×(nC0+nC1x+nC2x2.....nCnxn)

Answer»

Find the coefficient of xn2 in
(nC0+nC1x+nC2x2.....nCnxn)×(nC0+nC1x+nC2x2.....nCnxn)




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