Saturday

December 20, 2014

December 20, 2014

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

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 11:51pmAfter 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 = ?

**Answer this Question**

**Related Questions**

MATH Prob. - A box contains two black balls and three gold balls. Two balls are ...

statistics - A box contains 3 white and 5 black balls. Four balls are drawn at ...

math - I have a question in my math class in college. Here is the question, but ...

MATH 157 - Can anyone please help me understand these math problems. #4. How ...

Probability again - A box contains 6 red balls, 4 blue balls, and 2 green balls...

math - A box contains three white balls and two red balls. A ball is drawn at ...

College Discrete - An urn contains n > 0 white balls and m > 0 black ...

math - A box contains 8 blue balls and 2 red balls. Three balls are selected ...

finite math - A box contains 14 balls (10 red and 4 white). Three balls randomly...

Math - A bag contains three black balls, four white balls and five red balls. ...