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[" find "r.],[" 19.Prove that the coeffi...

[" find "r.],[" 19.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 "r" th and "(r+1)" th terms in the expansion of "(1+x)^(n)" ."]

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