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How many positive integers less than 10,000 are there in

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Re: How many positive integers less than 10,000 are there in [#permalink] New post 13 Jul 2013, 00:35
Bunuel wrote:

It's everywhere: on the 1st page, on the 2nd...

Notice that it's highly unlikely you'll need it for the GMAT.


I understood the various explanations there. But when employing that, isn't there the worry that you might have

XXXXXXXXXXXXX|||| ?
(There are 13 X's there.)

Since numbers in decimal only go up to 9, wouldn't the cases where there are 10 or more X's grouped together be a problem?
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Re: How many positive integers less than 10,000 are there in [#permalink] New post 25 Nov 2013, 04:18
Excellent solution Bunuel. Saves a minute at minimum !!! :)
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Re: How many positive integers less than 10,000 are there in [#permalink] New post 29 Nov 2013, 10:03
Hi Bunnel, please can explain when the separator concept is to be used and how to use it. Basically i did not understand in this question that why have we considered only 4 digit number. Please help.
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Re: How many positive integers less than 10,000 are there in [#permalink] New post 29 Nov 2013, 10:09
Expert's post
nayan19 wrote:
Hi Bunnel, please can explain when the separator concept is to be used and how to use it. Basically i did not understand in this question that why have we considered only 4 digit number. Please help.


Integers less than 10,000 are 1, 2, or 3-digit numbers. Post here: how-many-positive-integers-less-than-10-000-are-there-in-85291.html#p710836 explains that we can get single-digit as well as 2 or 3-digit numbers with that approach (check the examples there).

Similar questions to practice:
larry-michael-and-doug-have-five-donuts-to-share-if-any-108739.html
in-how-many-ways-can-5-different-rings-be-worn-in-four-126991.html

Hope this helps.
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Re: How many positive integers less than 10,000 are there in [#permalink] New post 27 Dec 2013, 14:33
Exceptionnal technique! Thanks all for this! Saves a lot of time in a lot of situations!

Incredible minds!

thanks !!
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Re: How many positive integers less than 10,000 are there in   [#permalink] 27 Dec 2013, 14:33
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