How many two-element subsets of <1, 2,3,4,5,6,7> are there that do not contain the pair of elements 2 and 4?	Pick
A) 11  B) 12  C) 14  D) 15  E) 20
7C2 - 1 = 20 Answer is 20
<result>E</result>
How many two-element subsets of <1, 2,3,4,5,6,7> are there that do not contain the pair of elements 2 and 4?