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Grade 9·11 problems·~13 min·Common Core Math - HS Functions·group·hsf-bf-a-2

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Procedures

A geometric sequence has $a_1 = 6$ and common ratio $r = 2$ .
Which explicit formula is correct?

$a_n = 6 \cdot 2^n$

$a_n = 6 \cdot 2^{n-1}$

$a_n = 6 + 2(n-1)$

$a_n = 2 \cdot 6^{n-1}$