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Q.

If f:RR is given by f(x)=x+1, then the value of limn1nf(0)+f5n+f10n+.+f5(n1)n is

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a

3/2

b

5/2

c

1/2

d

7/2

answer is D.

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Detailed Solution

Let

I=1nf(0)+f5n+f10n+..+f5(n1)n

 I=r=0n1f5rn1n

 I=01f(5x)dx                               ( assume r/n as x)=01(5x+1)dx                                      (f(x)=x+1)=52x2+x01=52+10=72

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