This is one of the poorest.
But the good news is that I can explain the suggested answer.
If we count peanuts and chocolate as a combination, then there are two ways to do that. More of one that the other, say one first then the other.
Now, I think that that is counter-intuitive.
But the key may be in the title: permutations
Using permutations is the only rational way to get 5 as an answer: implies .
Again, this a very poorly worded question.