How many two-element subsets of {6,7,8,9} are there that do not contain the pair of elements 8 and 9?
Select the correct option:
A) 5
B) 4
C) 3
D) 6
E) 7
Required subsets are = {6,7}, {6,8}, {6,9}, {7,8}, {7,9} = 5   5nswer: 5
<result>A</result>
How many two-element subsets of {6,7,8,9} are there that do not contain the pair of elements 8 and 9?