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If f(1)=1 and f(n+1)=2 f(n)+1, then f(n)...

If `f(1)=1` and `f(n+1)=2 f(n)+1`, then `f(n)` is

A

A.`2^(n+1)`

B

B.` 2^(n)`

C

C.`2^(n)-1`

D

D.`2^(n-1)-1`

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The correct Answer is:
C
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