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Q.

If f(x)=x+∫01(x+t)f(t)dt , then ∫01f(x)dx=

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a

−4

b

4

c

−7

d

7

answer is C.

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Detailed Solution

f(x)=x(1+∫01f(t)dt)+∫01tf(t)dt f(x)=(1+a)x+b,  wherea=∫01f(t)dt=∫01(1+a)t+b=1+a2+b b=∫01tf(t)dt=1+a3+b2 →a−2b=1,3b−2a=2 →a=−7,b=−4 ∫01f(x)dx=1+a2+b=−3−4=−7
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