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February 28, 2015

February 28, 2015

Posted by **DJ** on Tuesday, December 8, 2009 at 12:53am.

- MATH -
**drwls**, Tuesday, December 8, 2009 at 2:33am(2/3) of 4 = ?

- MATH -
**Lisa**, Tuesday, December 8, 2009 at 8:13am: A box contains two black balls and three gold balls. Two

balls are randomly drawn in succession from the box.

a. If there is no replacement, what is the probability

that both balls are black?

b. If there is replacement before the second draw, what

is the probability that both balls are black?

- MATH -
**Reiny**, Tuesday, December 8, 2009 at 8:28amPlease don't post a new question as part of somebody else problem & replies, it was just lucky I looked back at this one.

a) Prob(two blacks) = (2/5)(1/4) = 1/10

b) now it would be (2/5)(2/5) = 4/25

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