Which of the following ordered pairs are NOT integer values ("whole numbers")?

(
4
2
,
2
)
(
2
4

,2)

(
1
,
2
)
(1,2)

(
2.75
,
1.25
)
(2.75,1.25)

The ordered pair (2.75, 1.25) is the only pair that is NOT an integer value.