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A bag contains 12 red balls and 6 white balls. Six balls are drawns one by one without replacement of which at least 4 balls are white.

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A bag contains 12 red balls and 6 white balls. Six balls are drawns one by one without replacement of which at least 4 balls are white. Find the probability that in the next two drawns exactly one white ball is drawn. (Leave the answer in nCr).

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Let A1 be the event exactly 4 white balls have been drawn' 

A2 be the event exactly 5 white balls have been drawn. 

A3 be the event exactly 6 white balls have been drawn.

B be the event exactly 1 white ball is drawn from two draws.

 

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