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From mean value theoren : f(b)-f(a)=(b...

From mean value theoren : `f(b)-f(a)=(b-a)f^(prime)(x_1); a lt x_1 lt b` if `f(x)=1/x` , then `x_1` is equal to

A

`(a+b)/(2)`

B

`sqrt(ab)`

C

`(2ab)/(a+b)`

D

`(b-a)/(b+a)`

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The correct Answer is:
B
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