Question

The first term of a geometric sequence is 8, and the second term is 4. Find the fifth term. ?

Answer 1

`a_5=1/2`

Explanation:

The common ratio `r` is:
`r=4/8=1/2`

Write a formula:
`a_n=8(1/2)^(n-1)`

So the fifth term would be:
`a_5= 8(1/2)^(5-1)`

`a_5=8/16=1/2`