I found this challenging maths puzzle meant for primary 1 (6-7 years old) students in a local school and I've wracked my brains but to my shame can't seem to find any solution. Is there one?
Edit: I can't seem to embed the picture properly so I'll try to type the puzzle out:
1
2 3
3 4 4
2 1 _ 2
2 3 _ _ 2
The task is to discover the pattern and fill in the missing numbers.