JEE Novice - (7)

Probability Level 2

(nr−1):(nr):(nr+1)=2:4:5\Large {n \choose r-1} : {n \choose r} : {n \choose r+1} = 2:4:5

If positive integers n,rn,r satisfy the ratio above , find the value of n+rn+r.

This question is a part of JEE Novices.
Nihar Mahajan by Nihar Mahajan
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