--- In [email protected], "Mike Bennett" 
<[EMAIL PROTECTED]> wrote:
> 
> OE, PC, OC, PE.  1/8 + 1/6 + 1/27 + 1/12 = 89/216 (~41%)
> 
> And if that's wrong, I'd like to blame my 4th grade teacher. ;)

For 4x4 reducing it to 3x3, you have those two parity problems. Each 
has 50% chance of skipping. Does that mean you have 50%+50%=100% 
chance of skipping one of them? Btw, cool that you learn probability 
in 4th grade already! Too bad your teacher screwed it :-)

Cheers!
Stefan






 
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