SOLUTION: The partial sum 1+8+15+......+197 equals =

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Question 477107: The partial sum 1+8+15+......+197 equals =
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Find how many terms there are: 197 = 1 + (n-1)7
==> 196 = (n-1)7 ==> n-1 = 28 ==> n = 29.
==> Sum = (29/2)(1+197) = (29/2)(198) = 2,871.