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

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

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