if C1, C2, c3, C4 are the coefficient of 2nd, 3rd , 4th , and 5th , term in the expansion of (1+x)raise to "n" then prove that

C1/C1+c2  + c3/c3+c4 = 2c2/c2+c3     ((((((((((((((((((((( where c1+c2 , c3 +c4 and c2 + c3 are together under the division  THAT IS C1 BY C1 +C2 etc.))))))))))))

Let a1, a2, a3, a4 be the coefficients of 4 consecutive terms viz. the rth, the (r + 1)th, the (r + 2)th and the (r + 3)th terms.

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