Which recurrence relation describes the sequence an=3⋅2na_n = 3 \cdot 2^nan=3⋅2n?
an=2an−1a_n = 2a_{n-1}an=2an−1
an=3an−1a_n = 3a_{n-1}an=3an−1
an=an−1+2a_n = a_{n-1} + 2an=an−1+2
an=6an−1a_n = 6a_{n-1}an=6an−1