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How many five-digit numbers can be formed from the digits 0,

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CEO
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Joined: 12 Sep 2015
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Re: How many five-digit numbers can be formed from the digits 0,  [#permalink]

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New post 29 Aug 2018, 16:25
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rodri102 wrote:
Hi Bunuel. Could you clarify why we can't use 0 as the first digit? The question doesn't mention this as a restriction.

Thanks!


A 5-digit number can't have 0 in the ten thousands position.
For example, 03212 is not considered a 5-digit number.

If we allowed the first digit to be zero, then even a basic number like 1 could be a 2-digit number (01), a 3-digit number (001), a 4-digit number (0001), etc

Cheers,
Brent
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Brent Hanneson – GMATPrepNow.com
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Re: How many five-digit numbers can be formed from the digits 0,  [#permalink]

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New post 23 Sep 2018, 13:23
Hi, we need to form 5 digit number , if we start with 0 then we would only be able to form a 4 digit number. (restriction mentioned in question stem). Hope it helps.

rodri102 wrote:
Hi Bunuel. Could you clarify why we can't use 0 as the first digit? The question doesn't mention this as a restriction.

Thanks!
GMAT Club Bot
Re: How many five-digit numbers can be formed from the digits 0, &nbs [#permalink] 23 Sep 2018, 13:23

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