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The coefficients of the (r-1)^(th), r^(...

The coefficients of the `(r-1)^(th), r^(th)` and `(r+ 1)^(th)` terms in the expansion of `(x+1)^(n)` are in the ratio `1:3:5`. find n and r.

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The correct Answer is:
r=3 and n=7
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