Practice problem
Which of these is a geometric sequence in explicit form?
an=3n−1a_n = 3n-1an=3n−1
an=3an−1a_{n} = 3a_{n-1}an=3an−1
an=5⋅2n−1a_n = 5\cdot2^{n-1}an=5⋅2n−1
an=7⋅(n−1)4a_n =7\cdot(n-1)^4an=7⋅(n−1)4
Type a concept, like “slope” or “photosynthesis”.
