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February 28, 2015

February 28, 2015

Posted by **parth** on Wednesday, February 9, 2011 at 6:35am.

- arithmetic -
**Reiny**, Wednesday, February 9, 2011 at 9:55ama = 161

a+d = 154 , so d = -7

S(m) = (m/2)(2a + (m-1)d)

0 = m/2(322 - 7m+ 7)

329m - 7m^2=0

49m - m^2 = 0

m(49-m)=0

m = 49

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