Let fn(x) be the n^(th) derivative of f(...

Let `f_n(x)` be the `n^(th)` derivative of f(x). The least value of n
so that `f_n=f_(n+1)` where `f(x)=x^2+e^x` is

A

(a) `4`

B

(b) `5`

C

(c) `2`

D

(d) `3`

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The correct Answer is:

D

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Let `f_n(x)` be the `n^(th)` derivative of f(x). The least value of n so that `f_n=f_(n+1)` where `f(x)=x^2+e^x` is

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