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January 30, 2015

January 30, 2015

Posted by **Bishnu** on Tuesday, January 8, 2013 at 9:28am.

- arithmetic progression -
**bobpursley**, Tuesday, January 8, 2013 at 9:35amuse the first two facts to find d,a1

Sn=n/2(2a1+(n-1)d)

you will have two unknowns, two equations.

then, find s34

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