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# How many 2 elements subsets of {1, 2,3, 4 } are there and

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Manager
Joined: 05 Oct 2005
Posts: 200
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Kudos [?]: 1 [0], given: 0

How many 2 elements subsets of {1, 2,3, 4 } are there and [#permalink]  23 Nov 2005, 15:01
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How many 2 elements subsets of {1, 2,3, 4 } are there and do not contains the pair of element 2 AND 4 ?

1
2
4
5
6

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Director
Joined: 14 Sep 2005
Posts: 994
Location: South Korea
Followers: 2

Kudos [?]: 45 [0], given: 0

How many 2 elements subsets of {1, 2,3, 4 } are there and do not contain the pair of element 2 AND 4 ?

Total # of cases of picking 2 elements = 4C2 = 6
# of cases containing 2 AND 4 = 1

6 - 1 = 5
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