Wednesday, August 21, 2013

one group there was 7 male and some ladies. probability of choosing two ladies is 1/15. so how many ladies in there group?

P%282-L%29=%28x%2F%28x%2B7%29%29%28%28x-1%29%2F%28x-1%2B7%29%29=1%2F15 

Which leads to x=-1 or x=3 
x=3
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