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Mathematics 9 Online
OpenStudy (anonymous):

Find the partial sum Sn of the arithmetic sequence that satisfies the given conditions. a2 = 5, a5 = 6.5, n = 19

jhonyy9 (jhonyy9):

between a2 and a5 there are 1,5 the differenc - right ? 1,5/3 = 0,5 this mean that always the next term will increasing by 0,5

jhonyy9 (jhonyy9):

=>a1 = 4,5

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