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Q.

A bag contains 6 balls.  Two balls are drawn from it at random and both are found to be black.The probability that the bag contains at least 5 black balls is k7 . Then k =

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answer is 5.

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Detailed Solution

Pat least 5 black balls

 5C2+6C2 2C2+3C2+4C2+5C2+6C2=10+151+3+6+10+15

=2535=57

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