Find the First Term 3^(n+1)

$3^{n + 1}$

Substitute in the value of $n$ to find the $n$ th term.

$a_{1} = 3^{(1) + 1}$

Add $1$ and $1$ .

$a_{1} = 3^{2}$

Raise $3$ to the power of $2$ .

$a_{1} = 9$

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