If a1 a2 a3 and a4 be the coefficients of four consecutive terms in the expansion of (1+x)^n . Prove that (a1/a1+a2) + ( a3/a3+a4) = (2a^2/a1+a3)
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https://www.meritnation.com/ask-answer/question/if-c1-c2-c3-c4-are-the-coefficient-of-2nd-3rd-4th-a/binomial-theorem/2796781
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