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Programming
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Find the sum of the first 25 terms of the arithmetic sequence: 7,19,31,43,...

May 25th, 2015

d = 19 - 7 = 12

a25 = 7 + 12(25-1) = 7 + 12(24) = 7 + 288 = 295

S25 = 25(7+295) / 2

= 25(302) / 2

= 7550/2

= 3775

May 25th, 2015

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