Question

Suppose you could choose 2 boxes of markers. find all the possible pairs. 15 markers, 24 markers, 36 markers, 48 markers

Answer 1

15 & 24
15 & 36
15 & 48
24 & 36
24 & 48
36 & 48

Answer 2

There are 6 possible pairs

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.