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If f : RrarrR is such that f(3)=16,f'(3)...

If f : `RrarrR` is such that `f(3)=16,f'(3)=4,` then `underset(x rarr 3) lim(xf(3)-3f(x))/(x-3)=`

A

4

B

6

C

8

D

12

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