SOLUTION: Find the sum of arithmitic sequence. The 3rd term is -12 and the 7th term is 8

Question 976138: Find the sum of arithmitic sequence. The 3rd term is -12 and the 7th term is 8
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!

General term for the sequence is .

You did not say what limits for the sum you want. You can lookup the formula for sum of an arithmetic sequence or you can derive it yourself. A crude way to show the formula is like,

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