Mathematics, 25.08.2021 01:00 landonp101

A certain identification number is a sequence of nine digits. (a) How many identification numbers are possible?

(b) How many of them begin with either 023 or 003?
numbers

(c) How many identification numbers are possible if no two adjacent digits are the same? (For example, 235-93-2345 is permitted, but 126-67-8189 is not.)
numbers

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