1.

If a_r is the coefficient of x^r in the expansion of (1+x)^n then a_1/a_0 + 2.a_2/a_1 + 3.a_3/a_2 + …..+n.(a_n)/(a_(n-1))=

Answer»

`(N(n+1))/(2)`
`(n(n+3))/(2)`
`(n(n-1))/(2)`
`n^2`

ANSWER :A


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