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A 4-digit password is a number that begins with a 3 and does not contain a zero or nine. If digits can be repeated, how many possible passwords are there? 1,536 512 343
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A 4-digit password is a number that begins with a 3 and does not contain a zero or nine. If digits can be repeated, how many possible passwords are there?

1,536
512
343

User Tommy Grovnes
by
7.8k points

2 Answers

3 votes

The correct answer is 512

User Zhi Lv
by
7.6k points
2 votes
512 i think.............
User Joel Holmes
by
8.9k points
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