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Mathematics 20 Online
OpenStudy (anonymous):

what does each of these mean a_1, a_n, n, d, r and S

OpenStudy (anonymous):

Assuming you're referring to arithmetic progression: a_1 = first element a_n = n'th element n = number of element(s) d = common difference r = ? S = sum

OpenStudy (anonymous):

r = common ratio

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