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If two numbers are randomly selected from set (1, 2, 3, 4,

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CEO
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If two numbers are randomly selected from set (1, 2, 3, 4, [#permalink] New post 23 Oct 2007, 11:32
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If two numbers are randomly selected from set (1, 2, 3, 4, 5), what is the probability that the sum of the two numbers is biger than 4?

3/5
7/10
4/5
9/10
19/20
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Re: Challenge - Sum Probabilities [#permalink] New post 23 Oct 2007, 11:58
bmwhype2 wrote:
If two numbers are randomly selected from set (1, 2, 3, 4, 5), what is the probability that the sum of the two numbers is biger than 4?

3/5
7/10
4/5
9/10
19/20


C - 4/5

1+4/1+5/2+3/2+4/2+5/3+4/3+5/4+5

So, 8/(5C2) = 4/5
Re: Challenge - Sum Probabilities   [#permalink] 23 Oct 2007, 11:58
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If two numbers are randomly selected from set (1, 2, 3, 4,

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