Question

Ben rolls two standard number cubes 36 time. predict how many time he will roll a sum of four.

Answer 1

You can make a 6 x 6 square to illustrate  the probabilities 

   1 2 3 4 5 6
1 2 3 4 5 6 7
2 3 4 5 6 7 8
3 4 5 6 7 8 9
4 5 6 7 8 9 *
5 6 7 8 9  * &
6 7 8 9  * & $

* =10, & =11, $ = 12, I wanted maintain spacing

There are 3 4's. So it is 3/36 chance, which is 1/12 chance.