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December 22, 2014

December 22, 2014

Posted by **Anonymous** on Tuesday, November 3, 2009 at 1:15am.

-How many seats are in the auditorium?

- math -
**Reiny**, Tuesday, November 3, 2009 at 7:31amThis is an arithmetic series

Sum(n) = (n/2)[2a + (n-1)d]

where a is the first term

n is the number of terms

d is the common difference, and

Sum(n) is the sum of the n terms

So you want Sum(49)

with a=40, d=-3 and n = 49

substitute

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