Tuesday

January 27, 2015

January 27, 2015

Posted by **Lauren** on Wednesday, November 18, 2009 at 9:34pm.

A box contains 2 black balls and 3 gold balls. 2 balls are randomly drawn in succession.

a.if there is no replacement, what is the probablity that both balls are black?

b.if there is a replacement before the second draw, what is the probablitity that both balls are black?

My classes are online, and the text is very confusing and the equations for probability all seem to be exactly the same. Please help! Thanks.

- math -
**Reiny**, Wednesday, November 18, 2009 at 9:39pma) prob = (2/5)(1/4) = 2/20 = 1/10

b) prob = (2/5)(2/5) = 4/25

- math -
**Lauren**, Wednesday, November 18, 2009 at 9:41pmSo I just multiply the probability of each ball on each turn? Thank you sooo much! Why can't the text just say that?

**Answer this Question**

**Related Questions**

Math209 - I am in a college level math class and we have a question that I am ...

Nutrition - I am not finding the answer of this question in my text for my ...

Literature - Hi, I just have a question about a confusing question to me in a ...

English - 1. What's your favorite class? 2. It's math. 3. It's math class. 4. It...

History - I am in need of some help. I am not looking for the answer, just the ...

History - Hi I need some help with my history homework I have answer all of the ...

math - I do not know how to answer this question. Would someone please help me ...

Government - Hello, I need this question explained. You dont have to give me the...

chemistry - I have a worksheet that has a question on it the question states: ...

Math 156 - I already did the first and third question I just need some one to ...