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