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September 18, 2014

September 18, 2014

Posted by **Sarah** on Wednesday, January 9, 2013 at 1:33am.

i know how to do this in the "long" way but how do you do this is a "shorter" way by finding the pattern? Explain please!!

- MAth -
**Steve**, Wednesday, January 9, 2013 at 10:58amThe seat count forms an arithmetic sequence

25,27,29...

where a = 25, d=2

The sum of the 1st 20 terms is thus

S20 = 20/2 (2*25 + 19*2) = 880

- MAth -
**Sarah**, Wednesday, January 9, 2013 at 11:36pmwhat equation is that?

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