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Q.

The value of integral ∑k=1n ∫01 f(k−1+x)dx is

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a

∫01 (x)dx

b

∫02 f(x)dx

c

∫0n f(x)dx

d

n∫01 f(x)dx

answer is C.

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Detailed Solution

Let     I=∫01 f(k−1+x)dx⇒    I=∫k−1k f(t)dt, where t=k−1+x⇒    I=∫k−1k f(x)dx∴    ∑k=1n ∫k−1k f(x)dx=    ∫01 f(x)dx+∫12 f(x)dx+…+∫n−1n f(x)dx=∫0n f(x)dx
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