Homework Help: Probability

Posted by Tom on Wednesday, May 21, 2008 at 6:46pm.

An urn contains 7 red marbles labeled {1,2,3,4,5,6,7} and 5 green marbles labeled {1,2,3,4,5}. Four marbles are pulled out at once. What is the probability that

A. All four marbles are red?
B. More of the marbles are green than red?
C. Both red and green marbles are present?
D. Two of the marbles chosen are both labeled "5"?

Probability - Tom, Wednesday, May 21, 2008 at 6:54pm
I've tried but i need help =/
Probability - Anonymous, Wednesday, April 13, 2011 at 1:47pm
You are randomly drawing marbles from a bag containing 4 blue and 2 green marbles, replacing the marbles between draws. Which of the following will give the probability of drawing a blue marble on both your first and second draws?

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