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Find the sum of the arithmetic sequence. -1, 2, 5, 8, 11, 14, 17
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Just add all these together, there is not so many of them, lol.
(last term + 1st term) times number of term ------------------------------------- 2
56
yes :) idk, how have you done it, but... correct.
@lornbeach can I test you with 1 question ?
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