Practice problem
Which of these is a geometric sequence in recursive form?
an=4n−1a_n = 4^{n-1}an=4n−1
an−1=3ana_{n-1} = 3^{a_{n}}an−1=3an
an=6na_n = 6{n}an=6n
an=2an−1a_n = 2a_{n-1}an=2an−1
Type a concept, like “slope” or “photosynthesis”.
