Sum to \( n \) terms of the series \( 1+5+19+65+211+ \) ... is equal to....

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Sum to \( n \) terms of the series \( 1+5+19+65+211+ \)
\( \mathrm{P} \)
... is equal to
W
(1) \( 1 / 2\left(3^{n+1}-2^{n+2}+1\right) \)
(2) \( 1 / 2\left(3^{n}+2^{n}-1\right) \)
(3) \( 3^{n+1}-2^{n+2}-1 \)
(4) \( 3^{n}+2^{n}+1 \)


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