Prove that the co-efficient of xn in the expansion of (1+x)2n is twice – InterviewSolution

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1.	Prove that the co-efficient of xn in the expansion of (1+x)2n is twice the co-efficient of xn in the expansion of (1+x)2n−1.
Answer» Prove that the co-efficient of $x^{n}$ in the expansion of $(1 + x)^{2 n}$ is twice the co-efficient of $x^{n}$ in the expansion of $(1 + x)^{2 n - 1}$ .

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