From a bag containing 4 white balls and 5 black balls a person draws 3 balls at random. The odds in favour of these 3 balls being black are

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3 : 5

3 : 9

37 : 5

5 : 37

answer is D.

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Detailed Solution

A:event of getting three black n(A)=5c3,n(S)=9c3P(A)=542P(A¯)=3742P(A):P(A¯)=5:37

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