SOLUTION: Find the sum of the series 5 + 20 + 80 + ....+ 20 480

SOLUTION: Find the sum of the series 5 + 20 + 80 + ....+ 20 480

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Question 927581: Find the sum of the series 5 + 20 + 80 + ....+ 20 480

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
+ ....+
...first term
if you multiply it by you got second term , then if you multiply it by you got third term
if we write as , but to get first term we can write
so, general formula is
now find which term is

...if bases same, then
...solve for

also find:

then the sum is:

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