Answers

2016-07-30T18:55:01+08:00

3 + 7 + 11 + 15 + ··· + 99 has a1 = 3 and d = 4. To find n, use theexplicit formula for an arithmetic sequence.We solve 3 + (n – 1)·4 = 99 to get n = 25.:)
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