In general, when dealing with this unit, ask your self 2 questions. Does order matter, and do you pick with replacement or not (i.e. do the possibilities change as you pick from the "pile")?

Order matters and you do pick with replacement.

So Canada:

First spot, how many options?

26

Given that, how many options for the second spot?

10

Given, that, etc?

So you get:

26*10*26*10*26*10 = 26^3*1000 = ....

Give the US one a try.