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Let f : R to R be a function given by ...

Let ` f : R to R` be a function given by `f(x+y) = f(x) + f(y) ` for all x,y `in`R such that `f(1)= a` Then, `f (x)=`

A

`a^(x)`

B

`ax`

C

`a^(x)`

D

`a+x`

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The correct Answer is:
B
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