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# Combinatoric Question

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Intern
Joined: 16 May 2017
Posts: 5

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04 Nov 2017, 15:10
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hey guys,

I´m still reading the Manhattan Nurmber Proporties on page 48. The question is An office Manager must choose a five digit lock code for the office door. the first and last digits of th code must be odd, and no repetition of digits is allowed.How many different lock codes are possible?

So I´ve got 2 question.Why is it "x8x7x6"?Zero isnt allowed? Because normally on a code screen the Zero is available...
Next a repetition of number isnt allowed. In my opinion x8x7x6 could be a odd number, so in the end maybe Im not able to use 4 out of the ten digits?

Thank you!

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This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Math Expert
Joined: 02 Sep 2009
Posts: 47977

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04 Nov 2017, 15:17
Henni wrote:
hey guys,

I´m still reading the Manhattan Nurmber Proporties on page 48. The question is An office Manager must choose a five digit lock code for the office door. the first and last digits of th code must be odd, and no repetition of digits is allowed.How many different lock codes are possible?

So I´ve got 2 question.Why is it "x8x7x6"?Zero isnt allowed? Because normally on a code screen the Zero is available...
Next a repetition of number isnt allowed. In my opinion x8x7x6 could be a odd number, so in the end maybe Im not able to use 4 out of the ten digits?

Thank you!

Discussed here: an-office-manager-must-choose-a-five-digit-lock-code-for-the-95926.html

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: Combinatoric Question &nbs [#permalink] 04 Nov 2017, 15:17
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