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April 18, 2014

April 18, 2014

Posted by **Cennie** on Friday, September 24, 2010 at 5:45pm.

1 + 5 + 9 + 13 + 17, consecutive terms are 4 apart. If the first term in an arithmetic series is

3, the last term is 136, and the sum is 1,390, what are the first 3 terms?

- arithmetic -
**Reiny**, Friday, September 24, 2010 at 6:32pmhave you learned this property ?

S(n) = (n/2)(first + last) ?

1390 = (n/2)(3 + 136)

I get n = 20

so term(20) = a+19d = 136

19d = 133

d = 7

term 1 = 3

term 2 = 10

term 3 = 17

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