Question

I need help with number 5

Answer 1

What do you need help with? Like how to multiply, divided, ext..

Answer 2

Alright so let's think there is a blank one that represents 0 and a 1,2,3,4,5, and 6 in all that's 7 different numbers.

For an example you don't have to do this for every number, but here's how the 0,s might work.

0,0 0,1 0,2 0,3 0,4 0,5 0,6

That is 7 different combinations for only one number but that is not the answer.
There are 7 numbers and 7 combinations.

7x7= 49

The answer is 49 dominos in each set. I feel like a teacher now but I hope this helped you