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#1 2017-04-13 21:32:41
- markosheehan
- Member
- Registered: 2016-06-15
- Posts: 51
different digits
how many integers between 100 and 1000 have different digits.?
im trying to solve this using permutations.
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#2 2017-04-13 21:57:44
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: different digits
Different digits? All different?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#3 2017-04-13 22:19:38
- markosheehan
- Member
- Registered: 2016-06-15
- Posts: 51
Re: different digits
yes so 102,103,104 etc would be counted
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#4 2017-04-13 22:48:35
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: different digits
Hi;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#5 2017-04-15 00:06:25
- markosheehan
- Member
- Registered: 2016-06-15
- Posts: 51
Re: different digits
i was wondering how to work it out but i got it. its 9*9*8
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#6 2017-04-15 00:08:13
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: different digits
That is correct and very good!
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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