Posted by **Jenni** on Wednesday, December 15, 2010 at 8:22pm.

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 -
**PsyDAG**, Thursday, December 16, 2010 at 11:51pm
After first draw, there is one less black ball and one less total balls. To find probability of both/all events occurring, multiply the probabilities of the individual events.

a. 2/5 * 1/4 = ?

Probability is the same for both draws.

b. 2/5 * 2/5 = ?

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