You need to make a new six digit password using any letter or number.

Question

a) How many different options could you have if you’re allowed to repeat a letter or

number?

b) How many different options could you have if you aren’t allowed to repeat a letter or

number?

I'm very confused with this question, please explain with steps. Thank you

Answer 1

26 letters plus 10 digits equals 36 symbols.

With repeats 36⁶ = ?

Without repeats (36)(35)(34)(33)(32)(31) = ?