SOLUTION: The sum of first 20 and 50 terms of an AP is 420 and 2550. Find the eleventh term of a GP whose first term is the same as the AP and the common ratio is equal tithe common differen

Question 891695: The sum of first 20 and 50 terms of an AP is 420 and 2550. Find the eleventh term of a GP whose first term is the same as the AP and the common ratio is equal tithe common difference of the AP ?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
The sum of the first n terms of an AP is given by

==>
and
or and
Solving these equations give

==>
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