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OpenStudy (anonymous):
The r-th term of an arithmetic progression is 1+4r. Find, in terms of n,the sum of the first n terms of the progession.
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OpenStudy (anonymous):
@phi
OpenStudy (phi):
you use these formulas: http://regentsprep.org/Regents/math/algtrig/ATP2/ArithSeq.htm
OpenStudy (anonymous):
Thnx @phi
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