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Perms/combs 3U question (1 Viewer)

stealerhat

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This question came from 2013 James Ruse Extension 1 paper. It's multiple choice, but I have no idea how to do it. Can anybody help? I have the answer circled.
Perms and Combs Q.png
 

Elise8842

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http://tapatalk.imageshack.com/v2/14/09/10/d32bc8c3b1e8d875b9d83645c0f1c3a9.jpg[/

Bump~ don't get where that 2 in the denominator came from


~
 

braintic

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Don't worry - this is conditional probability - it is not in the course.
 

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