How many two-element subsets of \(\{1,2,3,4\}\) are there that do not contain the pair of elements \(2\) and \(4?\)

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How many two-element subsets of \(\{1,2,3,4\}\) are there that do not contain the pair of elements \(2\) and \(4?\)

(a) One
(b) Two
(c) Four
(d) Five
(e) Six

Answer: D

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