Question

What is the meaning to find the 15th term in the geometric sequence.

Answer 1

What is the formula for the nth term of a geometric sequence?

Answer 2

\[\Large a_{n} = a_{1}r^{n-1}\quad a _{1} = \text{First Term;} \text{ r = common ratio}\]

Answer 3

Here the first term = 20
common ratio r = 10/20 = 0.5
n = 15

Plug it into the formula and you will have your 15th term.