1.

Provethat the coefficient of xnin the expansion of (1 + x)2nis twice the coefficient of xnin the expansion of (1 + x)2n–1.

Answer»

Prove
that the coefficient of
xn
in the expansion of (1 +
x)2n
is twice the coefficient of
xn
in the expansion of (1 +
x)2n–1
.



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