Which of these sequences represents a geometric progression?
an=2n+3a_n = 2n + 3an=2n+3
an=3n+2na_n = 3^n + 2^nan=3n+2n
an=5⋅2na_n = 5 \cdot 2^{n}an=5⋅2n
an=n2a_n = n^2an=n2