Prove that the coefficient of (r+1)th term in the expansion of (1+x)n+ – InterviewSolution

1.	Prove that the coefficient of (r+1)th term in the expansion of (1+x)n+1 is equal to the sum of the coefficients of rth and (r+1)th terms in the expansion of (1+x)n.
Answer» Prove that the coefficient of (r+1)th term in the expansion of $(1 + x)^{n + 1}$ is equal to the sum of the coefficients of rth and (r+1)th terms in the expansion of $(1 + x)^{n} .$

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