SOLUTION: if the sum of first n terms of the series 5,9,13,17,....is 275 then find n.

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Question 893052: if the sum of first n terms of the series 5,9,13,17,....is 275 then find n.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
5%2B4%28n-1%29 general term

%28n%2F2%29%285%2B5%2B4%28n-1%29%29=275
Solve for n.