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Loose Cannon
 
^^^^^

I guess in theory you could multiply the ARPs (expressed as probabilities out of 1) of your two methods. So for example, pill plus male condom would be 0.05 x 0.14 = 0.007 = 0.7% ARP.

This is a greatly simplified view of things though, since an ARP is a statistic drawn from live data, not a fixed mathematical probability. I am not aware of any in depth statistical studies of combination birth control. Let us know what the Planned Parenthood people tell you.
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Old 11-15-2004, 08:59 AM Loose Cannon is offline  
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