Suppose you roll two dice find the number of elements in the event space of rolling a sum of 10

The event space is the list of all the different ways

that two dice could come up with a sum of 10.

Here they are:

Cube-A Cube-B

6 4

4 6

5 5

That's all the ways there are to roll a 10.

I am surprised.

These three combinations are all the elements

there are in that event space.