int(0)^(oo)[2e^(-x)]dx, where [.] deonte...

`int_(0)^(oo)[2e^(-x)]dx`, where `[.]` deontes greatest integer function, is equal to

A

0

B

`ln2`

C

`e^(2)`

D

`2e^(-1)`

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The correct Answer is:

B

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