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

Carmen spent 4 hours at the Y on Saturday. Two thirds of that time she spent in the gym. How many hours did she spend in the gym?

- 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 8:28am
Please 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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