Alan has forgotten his 4-digit PIN code. He knows the first digit is 3, and last digit is larger than 3. How many different sets of 4 digits could it be?

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asked Nov 28, 2022 36.8k views

10 votes

Alan has forgotten his 4-digit PIN code.

He knows the first digit is 3, and last digit is larger than 3.
How many different sets of 4 digits could it be?

Mathematics
high-school

Kyle Hughes asked

by Kyle Hughes

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2 Answers

8 votes

the first number obviously is 3 and the next number has to be bigger so its 6 .

Jessa answered Nov 29, 2022

by Jessa

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3 votes

If Alan knows one already, there is 3 more left for him to possibly know

Nighliber answered Dec 2, 2022

by Nighliber

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