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If e^(x)+e^(f(x))=e, then the domain of ...

If `e^(x)+e^(f(x))=e`, then the domain of the function f is

A

`(-oo, 1]`

B

`(-oo, 1)`

C

`(-1, oo)`

D

`[1, oo)`

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The correct Answer is:
B
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