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Q.

Let p(x) be a function defined on R such that  p'(x) = p'(1 – x), for all x∈[0,1],p(0)=1 and p(1) = 41. Then ∫01 p(x)dx equals

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a

41

b

42

c

41

d

21

answer is D.

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Detailed Solution

∫01 p(x)dx=∫01 1⋅p(x)dx=[xp(x)]01−I1=p(1)−I1where I1=∫01 xp′(x)dx=∫01 (1−x)p′(1−x)dx=∫01 (1−x)p′(x)dx=∫01 p′(x)dx−I1⇒ 2I1=[p(x)]01=p(1)−p(0)Thus, ∫01 p(x)dx=p(1)−12(p(1)−p(0))=12(p(1)+p(0))=12(41+1)=21
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Let p(x) be a function defined on R such that  p'(x) = p'(1 – x), for all x∈[0,1],p(0)=1 and p(1) = 41. Then ∫01 p(x)dx equals