Answer:
6 and less will give you a number less then 9
Explanation:
We know its not 7
because 7 + 2 < 9 = 9 = 9
we want something that is less then 9
1 up to 7 would give you an answer less then 9
6 + 2< 9 = 8 < 9
5 + 2 < 9 = 7 < 9
4 + 2 < 9 = 6 < 9
and more