If \( f(1)=1 \) and \( f(n+1)=2 f(n)+1 \) if \( n \geq 1 \), then \( f(n) \) is equal to
(a) \( ...
If \( f(1)=1 \) and \( f(n+1)=2 f(n)+1 \) if \( n \geq 1 \), then \( f(n) \) is equal to
(a) \( 2^{n}+1 \)
(b) \( 2^{n} \)
(c) \( 2^{n}-1 \)
(d) \( 2^{n-1}-1 \)
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