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If f(x) =lx ^(2) +mx+n, then the value o...

If `f(x) =lx ^(2) +mx+n,` then the value of `(f(x+3) -f(x))/(f(x+2)-f(x+1))` is-

A

0

B

`(2lx+3 l +m)/(lx+2l +m)`

C

3

D

none of these

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The correct Answer is:
C
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