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July 23, 2014

July 23, 2014

Posted by **Sally** on Wednesday, May 5, 2010 at 10:38pm.

- Math -
**Reiny**, Thursday, May 6, 2010 at 7:05amYou will have 2 choices

PN -- N for not prime

NP

prob = (4/9)(5/9) + (5/9)(4/9) = 40/81

- Math -
**Reiny**, Thursday, May 6, 2010 at 8:00amlooks like I forgot how to count, there are 10 tiles not 9

so

prob = (4/10)(6/10) + (6/10)(4/10) = 48/100 = 12/25

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