Thread: geometric series

Hi all
Theres this question about a geometric series that i can't figure out.
It says the second term is 375 and the fifth term is 81 and you have to show that the common ratio of the series is 0.6
I can't get the right answer :S

Thanks for the help x

Use the normal geometric progression and substitute the values you have

Term 2 = 375;
Term 5 = 81;


SO now you have to simultaneous equations

Can be solved

Originally Posted by katiethegreat

Hi all
Theres this question about a geometric series that i can't figure out.
It says the second term is 375 and the fifth term is 81 and you have to show that the common ratio of the series is 0.6
I can't get the right answer :S

Thanks for the help x

you should know the form of a geometric series ...



2nd term ...



5th term ...




divide the 5th term by the 2nd term ...