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math... 11th grade... arithmetic series

Forums: Math, Homework, 11th Grade, Arithmetc Series
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jocey101
 
Reply Sun 9 Dec, 2012 09:27 pm
math how do i evaluate this arithmetic series:

7+9+11+13..., n=10
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Type: Question • Score: 1 • Views: 853 • Replies: 2
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fresco
 
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Reply Sun 9 Dec, 2012 10:06 pm
@jocey101,
S=(n/2)(2a+(n-1)d) where a=7, n=10, d=2
sum = n times the average,
the average being half (first term plus last term)
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raprap
 
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Reply Mon 10 Dec, 2012 07:56 am
http://www.mathwords.com/a/arithmetic_series.htm

Rap
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