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If in the expansion of (a+b)^n\ a n d\ (...

If in the expansion of `(a+b)^n\ a n d\ (a+b)^(n+3)` , the ratio of the coefficients of second and third tems, and third and fourth terms respectively are equal, then `n` is a. 3 b. 4 c. 5 d. 6

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