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Numerade Educator

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Problem 23 Easy Difficulty

Suppose your cell phone uses a 4-digit personal identification number (PIN) to lock it from use.
How many PINs can you choose to lock your cell phone?

Answer

10,000

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Top Algebra Educators
Anna Marie V.

Campbell University

Heather Z.

Oregon State University

Alayna H.

McMaster University

Kristen K.

University of Michigan - Ann Arbor

Video Transcript

when you have a four digit pin number. Um, it's not just any four digits. There's a specific order that you have to enter those four digits. So that's gonna make this a permutation. Of the 10 digits that we have on our phone, we're gonna choose four of them. So that means that we have 5000 40 possible PIN numbers that we can choose.

University of Louisville
Top Algebra Educators
Anna Marie V.

Campbell University

Heather Z.

Oregon State University

Alayna H.

McMaster University

Kristen K.

University of Michigan - Ann Arbor