If (n+1)c_{r+1}: \: ^nc_{r}:^{n-1}c_{r-1}=8:3:1 then find the value of n:

CA CPT Dec 2016 Question Paper Quantitative Aptitude for online practice

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(n+1)c_{r+1}: \: ^nc_{r}:^{n-1}c_{r-1}=8:3:1

then find the value of n:

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