SOLUTION: What is the sum of the terms in an arithmetic progression obtained by inserting 7 arithmetic means between 3 and 35?

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Question 1003397: What is the sum of the terms in an arithmetic progression obtained by inserting 7 arithmetic means between 3 and 35?
Answer by CubeyThePenguin(3113) About Me  (Show Source):
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3, __, __, __, __, __, __, __, 35

difference: (35 - 3)/8 = 4

terms: 3 + 7 + 11 + 15 + 19 + 23 + 27 + 31 + 35 = 171