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a) thats a combination of 3 from 5..or 5 C 3

So 125 in the first one, and 20 in the second one. Why is it n(n-1)?

:/

Ok, let me check :)

I searched an in a permutation elements cant be repeated :/

You should do more research on permutations.

So the basic formulas are \[n ^{r}\] if they can be repeated and NCr, when they cant be repeated?

Thanks :)

yw

Yep, this helped me a lot :)

They're not the same :)

(from the question?, how can I know if order matters?

So it is 125 and 10 :)