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Let f(1)=1 and f(n)=2overset(n-1)underse...

Let `f(1)=1 and f(n)=2overset(n-1)underset(r=1)sum f( r )`. Then `overset(m) underset(n=1)sum f(n)` is equal to

A

`3^(m-1)-1`

B

`3^m-1`

C

`3^m-1`

D

none of these

Text Solution

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The correct Answer is:
B
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