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Q)

If $\;a_{1}=1\;,a_{n+1}=2a_{n}+1$ then , $\;a_{n+1}$ equals

$(a)\;2^n-2\qquad(b)\;2^{n+1}-2\qquad(c)\;2^n+1\qquad(d)\;2^{n+1}-1$

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