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Let a be a positive real number such tha...

Let a be a positive real number such that `int_(0)^(a)e^(x-[x])dx=10e-9` where [x] is the greatest integer less than or equal to X. Then a equal to :

A

`10 - log_(e)(1 + e)`

B

`10 + log_(e)2`

C

`10 + log_(e) 3`

D

`10 + log_(e) (1 + e)`

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The correct Answer is:
B
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