Answer
$2,4,8,16$
Work Step by Step
$a_{n+1} = 2a_n$
$a_1 = 2$
To find the first four terms, we need to find $a_1, a_2, a_3$, and $a_4$.
$a_1 = 2$
$a_2 = 2(2) = 4$
$a_3 = 2(4) = 8$
$a_4 = 2(8) = 16$
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