Math Is Fun Forum
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#76 2014-09-21 23:48:11
Re: Permutation Problems
It works!
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#77 2014-09-21 23:49:22
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Permutation Problems
And the answer for 5 would be?
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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#78 2014-09-22 00:14:14
Re: Permutation Problems
231
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#79 2014-09-22 00:18:38
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Permutation Problems
That is correct. 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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#80 2014-09-22 00:27:44
Re: Permutation Problems
Thanks!
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#81 2014-10-04 14:24:15
Re: Permutation Problems
In a remedial math class, the teacher decides to seat the students in an IQ order. The seats are setup in a way that they appear in a horizontal line. The order is such that when a hypothetical person x is to the left of a hypothetical person y, and x is not more than 8 IQ points higher than y.
For Example, Say that in the math class, there are five students that have IQs of 60, 65, 70, 75, and 80. The students would be put in an order of 60, 70, 65, 80, 75.
So, if the class had 20 students with IQ scores: 20, 25, 30, 35, 40, 45, 50, 55, 60, 64, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110. How many different ways are possible to place these students in an order defined above.
#Combinatorics #IQ
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#82 2014-10-04 18:29:04
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
Re: Permutation Problems
Hi Agnishom
In the example, isn't 70-60>8?
Last edited by anonimnystefy (2014-10-04 18:29:25)
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.
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#83 2014-10-04 19:08:21
Re: Permutation Problems
Yes, but 70 is to the right of 60
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#84 2014-10-04 19:26:52
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
Re: Permutation Problems
Ah, okay, I get it.
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.
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#85 2014-11-04 03:48:50
Re: Permutation Problems
Problem fell victim to dynamic programming
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#86 2014-11-04 07:40:07
- ShivamS
- Member
- Registered: 2011-02-07
- Posts: 3,648
Re: Permutation Problems
In a remedial math class, the teacher decides to seat the students in an IQ order. The seats are setup in a way that they appear in a horizontal line. The order is such that when a hypothetical person x is to the left of a hypothetical person y, and x is not more than 8 IQ points higher than y.
For Example, Say that in the math class, there are five students that have IQs of 60, 65, 70, 75, and 80. The students would be put in an order of 60, 70, 65, 80, 75.
So, if the class had 20 students with IQ scores: 20, 25, 30, 35, 40, 45, 50, 55, 60, 64, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110. How many different ways are possible to place these students in an order defined above.
#Combinatorics #IQ
It might be best to halt discussions on the solution to this problem on here and on Brilliant as this is a question that is a part of a mathematics competition that will accept submissions until November 5, 2014.
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#87 2014-11-05 02:03:08
Re: Permutation Problems
I wish I had seen this earlier, I just mailed my solution to Axas.
What competition is that?
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#88 2014-11-05 02:09:22
- ShivamS
- Member
- Registered: 2011-02-07
- Posts: 3,648
Re: Permutation Problems
I wish I had seen this earlier, I just mailed my solution to Axas.
What competition is that?
That guy who posted it on Brilliant has asked the problem on SE and PF already (locked on SE and deleted on PF).
The competition is USAMTS.
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#89 2014-11-05 02:10:55
Re: Permutation Problems
Yes, and he deleted it on Brilliant when I pointed out that he has posted in SE already
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#90 2014-11-05 02:39:23
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Permutation Problems
Got some of that happening in here too.
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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#91 2014-11-05 02:43:23
Re: Permutation Problems
I think it is November 5, already
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.
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#92 2014-11-05 07:40:18
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Permutation Problems
Hi;
Did not mean that one there are others coming in with contest problems.
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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