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28 Nov 2013, 15:12
Kudos
Bookmarks
Dear Expert:
Please, help me out with the following problem;
What is the probability of taking out two green marbles at one time both from a basket with three green marbles, two blue, and 5 red.
The trick is that the two marbles are took out at the same time. Not one after the other.
It looks that the answer is 10/64 or 5/32 but i don´t know how!
Thanks for your help!
Please, help me out with the following problem;
What is the probability of taking out two green marbles at one time both from a basket with three green marbles, two blue, and 5 red.
The trick is that the two marbles are took out at the same time. Not one after the other.
It looks that the answer is 10/64 or 5/32 but i don´t know how!
Thanks for your help!
28 Nov 2013, 21:58
Kudos
Bookmarks
UlisesOrdonez
Number of ways of selecting two green marbles out of 3 = 3C2 = 3
Number of ways of selecting 2 marbles out of a total of 10 marbles = 10C2 = 45
Probability that the two marbles we pick are green = 3/45 = 1/15
