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October 20, 2014

October 20, 2014

Posted by **Anonymous** on Tuesday, October 30, 2012 at 1:12pm.

- math -
**Steve**, Tuesday, October 30, 2012 at 2:14pmAs you (should) know,

Sn = n/2 (a1 + an)

S33 = 33/2 (a1 + a33)

= 33/2 (3 - 253)

= 33/2 (-250)

= -33*125 = -4125

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