Help with simple maths question?!!!!

Posted on 2015-08-28 13:07:00 in Math by KINO

Hi guys, I just started learning about perms and combs and I'm stuck with these homework questions:

1) How many 6-digit COMBINATIONS of the digits from 1 to 9 are there?

2) How many 6-digit ordered ARRANGEMENTS of the digits from 1 to 9 are there (i.e. digits cannot be repeated)?

3) How many 6 digit ARRANGEMENTS of the digits from 1 to 9 are there (i.e. digits can be repeated)?

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