SOLUTION: Find the sum of the first 40 terms of 14,17,20,...

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Question 880265: Find the sum of the first 40 terms of 14,17,20,...
Answer by richwmiller(17219) About Me  (Show Source):
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S = ½(2a + (n-1)d)n
S = ½(2*14 + 3*39)40
S = 20(28 + 117)
S=20*145
s=2900