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

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How many 2 elements subsets of {1, 2,3, 4 } are there and [#permalink] New post 23 Nov 2005, 16:01
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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

plz Explain your work


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 [#permalink] New post 23 Nov 2005, 20:19
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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  [#permalink] 23 Nov 2005, 20:19
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How many 2 elements subsets of {1, 2,3, 4 } are there and

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