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Let f(x+y)=f(x).f(y) for all x and y and...

Let `f(x+y)=f(x).f(y)` for all x and y and `f(1)=2.` If in as triangle ABC, `a=f(3), b=f(1)+f(3), c=f(2)+f(3), then 2A=` (A) C (B) 2C (C) 3C (D) 4C

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