Find the First Term a_n=3(2)^n

$a_{n} = 3 {(2)}^{n}$

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

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

Evaluate the exponent.

$a_{1} = 3 \cdot 2$

Multiply $3$ by $2$ .

$a_{1} = 6$