Homework Help: arithmetic

Posted by Donald on Thursday, March 10, 2011 at 8:40pm.

Given that an arithmetic sequence has a common difference of 5 and sum of the first 10 terms is 245, the first term is?

arithmetic - Anonymous, Sunday, April 17, 2011 at 7:29pm
The first term is 2.

2+7+12+17+22+27+32+37+42+47 = 245

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