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