Homework Help: math-algebra

Posted by Anonymous on Wednesday, September 26, 2007 at 12:59am.

7. A bag contains 5 red marbles, 6 green marbles, and 9 blue marbles. Suppose 3 marbles are chosen without replacement. What is the probability of choosing a red, a blue, and a red in that order?:

A. 9/320

B. 5/152

C. 1/1280

D. 1/38

math-algebra - PsyDAG, Wednesday, September 26, 2007 at 12:43pm
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in a another post. Thank you.
math-algebra - Fred, Thursday, December 8, 2011 at 9:24am
This answer was scored wrong, but I do not know why. If someone would kindly show me the error, I would appreciate it.
First choice probability: 5/20
Second choice probability: 6/19
Third choice probability: 9/18

Total Probability: (5/20)(5/19(9/18)=3/76

This answer is not featured above but the math seems correct. Each successive choice has fewer balls remaining, and the correct number of the desired balls for the next choice still remains in the bag for all the choices. The total probability is the product of the probability of each choice.
math-algebra - Anonymous, Tuesday, February 21, 2012 at 12:19am
(¡) 5/17
math-algebra - Cesar, Friday, February 24, 2012 at 12:59am
the answer is B. when you multiply you get (225/6840) simplifing this and you will get 5/152.
math-algebra - james, Thursday, March 8, 2012 at 10:08pm
A cup contains 9 red jelly beans, 8 green jelly beans, and 8 blue jelly beans.

If a jelly bean is randomly chosen, what is the probability that it is not green? Write your answer as a simplified fraction.
math-algebra - james, Thursday, March 8, 2012 at 10:20pm
A cup contains 9 red jelly beans, 8 green jelly beans, and 8 blue jelly beans.

If a jelly bean is randomly chosen, what is the probability that it is not green? Write your answer as a simplified fraction.
math-algebra - Anonymous, Saturday, October 6, 2012 at 3:25pm
17/25

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