Math Main Page => Exercises - Math V-probability     Tweet   Goal: to practice the probability of the events
Friday February 03 2012 09:01:46 PM		Friday February 03 2012 09:01:46 PM Flip Answers
[Assume one pull could pull out one and only one marble.]   If bagA contains marbles with three colors, 2 blue, 11 red and 6 green,     bagB contains marbles with three colors, 3 blue, 10 red and 4 brown,
1)	what's the probability of pulling out one blue marble in the first pull [From bagA]?		1) 2/19
2)	what's the probability of pulling out one red marble first and then one blue marble in next pull [From bagA]?		2) (2*11)/(19*18)=11/171
3)	what's the probability of pulling out three green marbles in the first three pulls? [From bagA]		3) 6*5*4/(19*18*17)=20/969
4)	what's the probability of pulling out one red or blue marble in the first pull? [From bagA]		4) 13/19
5)	what's the probability of pulling out three marbles one by one and they all are different colors? [From bagA]		5) 6*2*11*6/(19*18*17)=44/323
6)	what's the probability of pulling out one marble each from two bags and both are blue?		6) 2*3/(19*17)=6/323
7)	what's the probability of pulling out one marble each from two bags and both are same color?		7) (2*3+11*10)/(19*17)=116/323
8)	what's the probability of pulling out one marble each from two bags and they are different colors?		8) 1-(2*3+11*10)/(19*17)=207/323
Score: ______________

Provided by TigerNT.com