SOLUTION: Find General term for (An) for arithmetic sequence where a1=13 and a4=25

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Question 1010133: Find General term for (An) for arithmetic sequence where
a1=13 and a4=25

Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
%2825-13%29%2F3=4 for the common difference;

13%2B%28n-1%29%2A4, general term, using n for the index.

The number of common differences from a%5B1%5D to a%5B4%5D is three of them.