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If the straight line x=b divide the area...

If the straight line x=b divide the area enclosed by `y=(1-x)^(2),y=0 and x=0` into two parts `R_(1)(0lexleb) and R_(2)(blexle1)` such that `R_(1)-R_(2)=1/4`. Then, b equals to

A

`3/4`

B

`1/2`

C

`1/3`

D

`1/4`

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