Answer:
(5n+4p)(5n+4p) or (5n+4p)^2
Step-by-step explanation:
i took the test :p
Try this solution, if it is possible check it in the other sources.
P.S. for the radius of convergence: it is clear that all the members of the series (except the 1st and the 2d ones) are '0'.
Answer: $23
Step-by-step explanation: