1.

Differential coefficient of (x^((l + m)/(m - n)))^(1/(n-1)).(x^((m +n)/(n -1)))^(1/(l - m)).(x^((n + 1)/(l - m)))^(1/(m -n)) w.r.tx is

Answer»

`1`
`0`
`-1`
`x^(lmn)`

Answer :B


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