Answer:
1, 2 and 3
Explanation:
substitute the values from the set into the inequality and check validity.
n = 1
1 + 2 < 6
3 < 6 ← True
n = 2
2 + 2 < 6
4 < 6 ← True
n = 3
3 + 2 < 6
5 < 6 ← True
n = 4
4 + 2 < 6
6 < 6 ← False
n = 5
5 + 2 < 6
7 < 6 ← False
the values 1, 2 and 3 from the set make the inequality true