Ian has 11 stickers justinhas 3 fewer stickers then Ian.how many stickers does Justin have.

Help finding probability involving combinations?

What is the probability of winning in this game ( Show calculation and all works)

- The board is a number ranging from 1 - 12
- Player place a coin in the desire number 1,2,3,4 etc.
- Roll 2 dice
- To win get the sum of the two number, or the individual number from each die.

For example if the player placed a coin in the number 5.
Then rolled the two dice, the two number that appeared are 5 and 3.
To win player need to placed the coin in 3 or 5 or 8 (sum of 5 and 3)
In this case the player won.

Again what is the probability of winning this game, please show solution. Permutation or Combination?