Question

What is the 4th term in a geometric sequence for which a1=15 and r=1/3

Answer 1

geometric goes liket his

`a_n=a_1(r)^(n-1)`
given
a1=15
r=1/3
find a4 or 4th term


`a_4=15( (1)/(3) )^(4-1)`

`a_4=15( (1)/(3) )^(3)`

`a_4=15 ((1)/(27))`

`a_4=(15)/(27)`

`a_4=(5)/(9)`
4th term is 5/9