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Mathematics, 21.05.2020 21:05 jerlin1103

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Find the arithmetic mean a_n of the given terms.
a_(n-1)=9, a_(n+1)=-3

Given two terms of the arithmetic sequence, a_9 = 35 and a_14 = -15, find a_1 and d.

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Find the arithmetic mean a_n of the given terms.
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