math
posted by Lauren .
I have a question in my math class in college. Here is the question, but I just need help on HOW to answer it. My text isn't clear at all.
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.
Respond to this Question
Similar Questions

Physics
The "karat" is a dimensionless unit that is used to indicate the proportion of gold in a goldcontaining alloy. An alloy that is one karat gold contains a weight of pure gold that is one part in twentyfour. What is the volume of gold … 
Physics, still don't get it!
The "karat" is a dimensionless unit that is used to indicate the proportion of gold in a goldcontaining alloy. An alloy that is one karat gold contains a weight of pure gold that is one part in twentyfour. What is the volume of gold … 
statistics
Two urns each contain yellow balls and black balls. Urn 1 contains 2 yellow balls and 6 black balls. urn2 contains 2 yellow balls and 5 black balls. A ball is drawn from each urn. What is the probability that both balls are yellow? 
Math209
I am in a college level math class and we have a question that I am suppose to answer however I looked for this in our text and online and I am not finding a direct answer to it. Here is my question, What is the meaning of the word … 
MATH Prob.
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? 
elementry math
A box contains three black balls and two gold balls. A ball is selected at random, its color is recorded, and it is then replaced. A second ball is then selected at random and its color recorded. The outcome associated with this type … 
Math
my problem is: From the box containing 5 red balls, 7 blue balls, 10 black balls. you select 4 balls what is the probabilty that EXACTLY 2 balls are black. i know that you start it/set it up like this: c(10,2)c(2,1) divided by c(22,4) … 
math
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? 
statistics
A box contains 3 white and 5 black balls. Four balls are drawn at random "with replacement" from the box (i.e. selected balls are returned to the box and mixed, before drawing the next ball). Let X be the number of black balls drawn. … 
Math
A box contains 8 white balls, 7 black and 4 red. How many red balls must be added to the box so that the probability is 3/4?