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Let `f:(0,oo)rarrR and F(x)=int_0^x t.f(t)dt.`If `F(x^2)=x^4+x^5,` then `sum_(r=1)^12f(r^2)` equals (A) `216` (B) `219` (C) `221` (D) `225`

A

`216`

B

`219`

C

`221`

D

`225`

Text Solution

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