Math Main Page => Exercises - Math V-probability   Goal: to practise the probability of the events
Thursday March 11 2010 02:56:56 PM		Thursday March 11 2010 02:56:56 PM Flip Answers
[Assume one poll could poll out one and only one marble.]   If bagA contains marbles with three colors, 8 blue, 12 red and 7 green,     bagB contains marbles with three colors, 7 blue, 6 red and 7 brown,
1)	what's the probability of polling out one red marble in the first poll [From bagA]?		1) 8/27
2)	what's the probability of polling out one red marble first and then one blue marble in next poll [From bagA]?		2) (8*12)/(27*26)=16/117
3)	what's the probability of polling out three green marbles in the first three polls? [From bagA]		3) 7*6*5/(27*26*25)=7/585
4)	what's the probability of polling out one red or blue marble in the first poll? [From bagA]		4) 20/27
5)	what's the probability of polling out three marbles one by one and they all are different colors? [From bagA]		5) 6*8*12*7/(27*26*25)=224/975
6)	what's the probability of polling out one marble each from two bags and both are red?		6) 8*7/(27*20)=14/135
7)	what's the probability of polling out one marble each from two bags and both are same color?		7) (8*7+12*6)/(27*20)=32/135
8)	what's the probability of polling out one marble each from two bags and they are different colors?		8) 1-(8*7+12*6)/(27*20)=103/135
Score: ______________

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