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

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CEO
Joined: 21 Jan 2007
Posts: 2766
Location: New York City
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Kudos [?]: 331 [0], given: 4

If two numbers are randomly selected from set (1, 2, 3, 4, [#permalink]  23 Oct 2007, 11:32
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
Senior Manager
Joined: 11 Sep 2005
Posts: 329
Followers: 1

Kudos [?]: 37 [0], given: 0

Re: Challenge - Sum Probabilities [#permalink]  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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