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If C1,C2,C3,C4 are the coefficients of a...

If `C_1,C_2,C_3,C_4` are the coefficients of any four consecutive terms in the expansion of `(1+ x)^n`, prove that : `C_1/(C_1+C_2)+C_3/(C_3+C_4)=(2C_2)/(C_2+C_3)`.

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