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How many different zip codes can be made with the digits 0-9 if no digit is used more than once and the first digit is not 0?

A zip code contains 5 digits.

Asked by Ejazmoaz, Last updated: Apr 01, 2024

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2 Answers

John Adney

John Adney

John Adney
John Adney

Answered Oct 27, 2017

(9*9*8*7*6) this is because this can happen in two different ways. First by choosing from 9 digits 5 and then in how many ways one can arrange 0 if it must not start.

i.e P(9,5) * 9.

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John Smith

John Smith

John Smith
John Smith

Answered Jul 13, 2017

9 x 9 x 8 x 7 x 6
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