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May 3, 2015

Homework Help: Math

Posted by Jon on Tuesday, March 4, 2008 at 12:18pm.

Find a1 in a geometric series for which Sn=189,r=1/2,and an=3.

Sn=a1(1-r^n)/1-r
189=a1(1-1/2^3)/1-1/2
189=a1(-.5)/.5
189/-.25
a1=-756

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