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January 28, 2015

January 28, 2015

Posted by **yorkie16** on Thursday, April 23, 2009 at 12:20pm.

- math -
**dragon girl**, Thursday, April 23, 2009 at 3:38pm3 out of 9?

- math -
**Reiny**, Thursday, April 23, 2009 at 3:39pmso three are not cracked.

prob of getting 2 not cracked = 3/9)(2/8) = 1/12

or

choose 2 from the 3 non-cracked = C(3,2) = 3

choose any 2 of the 9 = C(9,2) = 36

so prob = 3/36 = 1/12

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