[Self doubt] Permutation

Question

Default permutation is with repetition or not?I came across some questions and it was nothing mentioned like repetition and all.But if questions says how many passwords then it was assumed that they are distinct and repetition not allowed and some questions asks like how many licenses number possible where 1 letter followed by 4 digits etc. and in these question it was with repitiion.So how to differentiate between these two?

Comments

If nothing is mentioned means you are a free bird. You can choose anything i mean to say.

so yes repeat numbers if you want.