I need a hint for this one. I think I may be missing something here.
Find the first term and common ratio if,
Thanks for your help!
I suppose are, respectively, the sum of first 5,9 and 10 terms--right?
If this is the case and first term= , ratio= , then the sum of the GP series upto first terms will be
So your first equation reduces to and second equation reduces to
Solve these two equations to get and .