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(nr−1):(nr):(nr+1)=2:4:5\Large {n \choose r-1} : {n \choose r} : {n \choose r+1} = 2:4:5 (r−1n):(rn):(r+1n)=2:4:5
If positive integers n,rn,rn,r satisfy the ratio above , find the value of n+rn+rn+r.
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