Let f(1)=1 and f(n)=2 sum(r=1)^(n-1)f(r)...

Let `f(1)=1` and `f(n)=2 sum_(r=1)^(n-1)f(r)` then `sum_(n=1)^(m)f(n)=`

A

`3^(m)-1`

B

`3^(m)`

C

`3^(m-1)`

D

`3^(m-2)`

Verified by Experts

The correct Answer is:

C

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