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09 Nov 2005, 11:38
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There are 5 balls in a bin. Two of them are labeled '1', two of them are labeled '5', and the last one is labeled '15'. Two balls are drawn out of this bin and their sum is computed. What is the probability that this sum is equal to 6?
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09 Nov 2005, 11:48
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Balls:
(1) (1) (5) (5) (15)
Total possibility to draw balls: 5c2 = 5x4/2 = 10
Possibility drawing two balls, which sum up to 6 are: (1) and (5)
(5) and (1) = 2 possibilities
probability is 2/10 = 1/5
(1) (1) (5) (5) (15)
Total possibility to draw balls: 5c2 = 5x4/2 = 10
Possibility drawing two balls, which sum up to 6 are: (1) and (5)
(5) and (1) = 2 possibilities
probability is 2/10 = 1/5
09 Nov 2005, 12:37
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nero44
(1)(1)(5)(5)(15)
A B C D E
So, someone can choose AC AD BC or BD. hence the total probability of drawing two balls with sum 6 = 4/10 = 2/5
