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The coefficients of (r-1)^(t h),\ r t h\...

The coefficients of `(r-1)^(t h),\ r t h\ a n d\ (r+1)^(t h)` terms in the expansion of `(x+1)^n` are in the ratio 1:3:5. Find `n\ a n d\ rdot`

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