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January 30, 2015

January 30, 2015

Posted by **alejandro** on Monday, September 10, 2012 at 3:52pm.

- math30 -
**Steve**, Monday, September 10, 2012 at 6:16pmr^2 = 9

r = 3 or -3

terms: 7 21 63 . . .

or: 7 -21 63 . . .

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