nCr-1 : nCr : nCr+1 =3:4:5 find r
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n! /(n-r+1) (r-1)! :n! /(n-r) r! :n! /(n-r-1)(r+1)! =3:4:5
then try to solve..you will get the answer
then try to solve..you will get the answer
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