Use the "term" formula to create an equation in the 2 variables,  and 

Term formula: 

Use the "sum of terms" formula to create an equation in the 2 variables,  and 

Sum of terms formula: 



From the 2 equations just formed, solve for the 2 variables,  and 



You should get: 1st term, or   

You should get: common difference, or    

Then do a check!! 

===================

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