Asked by Lee
Given the sequence: 89, 103, 117, 131, ……, find
the sum of teams from the 8th to the 15th inclusive
the sum of teams from the 8th to the 15th inclusive
Answers
Answered by
oobleck
sum(8..15) = sum(1..15) - sum(1..7)
so, since a=89 and d=14, you have
15/2 (2*89 + 14*14) - 7/2 (2*89 + 6*14) = 1888
so, since a=89 and d=14, you have
15/2 (2*89 + 14*14) - 7/2 (2*89 + 6*14) = 1888
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