Homework Help: math

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

A package contains 9 candy canes, 6 of which are cracked. If 2 are selected, find the probability of getting no cracked candy canes.

math - dragon girl, Thursday, April 23, 2009 at 3:38pm
3 out of 9?
math - Reiny, Thursday, April 23, 2009 at 3:39pm
so 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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