Find the First Term a_n=2^(n-1)

$a_{n} = 2^{n - 1}$

Step 1

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

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

Step 2

Subtract $1$ from $1$ .

$a_{1} = 2^{0}$

Step 3

Anything raised to $0$ is $1$ .

$a_{1} = 1$