Homework Help: math

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 = ?

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 ...
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 ...
MATH 157 - Can anyone please help me understand these math problems. #4. How ...
finite math - A box contains 14 balls (10 red and 4 white). Three balls randomly...
statistics - Two urns each contain yellow balls and black balls. Urn 1 contains ...
maths-probabilty - A box contains 5 red balls and 6 black balls. in how many ...
math - A box contains 6 red balls, 4 white balls, and 5 green balls. If three ...

For Further Reading

First Name:
School Subject:
Answer: