Permutations
The number of permutations is how many different ways can you arrange things.
Let’s take two dice as an example: dice 1 (D1) and dice 2 (D2). There are 36 permutations, or ways you can arrange the dice:
D1: 1, D2: 1
D1: 1, D2: 2
D1: 1, D2: 3
D1: 1, D2: 4
D1: 1, D2: 5
D1: 1, D2: 6
D1: 2, D2: 1
D1: 2, D2: 2
D1: 2, D2: 3
D1: 2, D2: 4
D1: 2, D2: 5
…
Combinations
The number of combinations is how many ways can you combine a group of items (order doesn’t matter) to obtain the desired result.
Let’s take two dice as an example. There are 3 combinations for rolling a 7:
1, 6
2, 5
3, 4