Question

Find a general formula for the nth term of the geometric series with: a_4 = 16 and r = 2.

Answer 1

@campbell_st

Answer 2

\[a_4=16,~~r=2\]\[a_1=a_4\div(2^{4-1})=16\div8=2\]
\[a_n=a_1\times r^{n-1}\]

Answer 3

Thank you @((*-*))