Answer:
There are 6 possible pairs
Step-by-step explanation:
You have 4 boxes, each one has 15 markers, 24 markers, 36 markers and 48 markers. You can choose 2 boxes, the combinations are:
15 markers & 24 markers
15 markers & 36 markers
15 markers & 48 markers
24 markers & 36 markers
24 markers & 48 markers
36 markers & 48 markers
Notice that, for example, 24 markers & 15 markers is already chosen, that is, the order doesn't matter.
