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Answered 2013-04-12 18:46:23

The probability of getting on the first draw a black ball is: P(B1) =

3/7.

The probability of getting a red ball given the event of drawing a black ball on the

first draw is: P(R2│B1) =

4/6.

The probability of drawing a black ball on the first draw and a red ball on the second draw is: P(B1UR2) =

P(B1)∙P(R

2│B1) =

(3/7)∙(4/6) =

0.2857... ~ 0.286 ~ ~ 28.6%

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