1.

Find the coefficient of x4 in the expansion of (1+x)n(1−x)n. Deduce that C2=C0C4−C1C3+C2C2−C3C1+C4C0, where, C stands for nCr.

Answer»

Find the coefficient of x4 in the expansion of (1+x)n(1x)n. Deduce that C2=C0C4C1C3+C2C2C3C1+C4C0, where, C stands for nCr.



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