Let f : (2, oo) rarr N be defined by f (...

Let f : `(2, oo) rarr N` be defined by `f (x)=` the largest prime factor of [x]. Then `int_(2)^(8) f(x) dx` is equal to -

A

17

B

22

C

23

D

25

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The correct Answer is:

B

`underset(2)overset(8)(int) f(x) dx=2+3+2+5+3+7=22`

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