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#1 2014-03-31 19:13:42

niharika_kumar
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From: Numeraland
Registered: 2013-02-12
Posts: 894

permutation

Q.) There are stall for 10 animals in a ship.In how many ways can the ship load be made if there are cows ,calves and horses to be transported, animals of each kind being not less than 10?

Last edited by niharika_kumar (2014-03-31 19:59:25)


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#2 2014-03-31 19:56:11

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 82,991

Re: permutation

Is there something missing in that space between transported and animals?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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#3 2014-03-31 19:59:57

niharika_kumar
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From: Numeraland
Registered: 2013-02-12
Posts: 894

Re: permutation

sorry, that was a mistake.I corrected it.


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#4 2014-03-31 20:03:35

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 82,991

Re: permutation

Hi;

Is that the exact wording of the problem?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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#5 2014-03-31 20:10:12

niharika_kumar
Member
From: Numeraland
Registered: 2013-02-12
Posts: 894

Re: permutation

yes and i find it difficult to understand.
the answer in the book is given as 3^10.


friendship is tan 90°.

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#6 2014-03-31 20:14:03

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 82,991

Re: permutation

There wording is a little funny but there are 3 for the first stall and 3 for the second and 3 for the third... 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 = 3^10.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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#7 2014-03-31 20:18:22

niharika_kumar
Member
From: Numeraland
Registered: 2013-02-12
Posts: 894

Re: permutation

i still don't get this. sad


friendship is tan 90°.

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#8 2014-03-31 20:29:03

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 82,991

Re: permutation

Here is one permutation of the stalls:

{cow, cow, calf, horse, cow, horse, horse, calf, calf, cow}

here is another

{horse, cow, calf, cow, cow, cow, cow, horse, calf, cow}

and another

{cow, cow, horse, calf, horse, calf, calf, cow, cow, calf}.

Do you see that each stall has 3 choices, a cow or a horse or a calf?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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#9 2014-04-01 16:57:25

niharika_kumar
Member
From: Numeraland
Registered: 2013-02-12
Posts: 894

Re: permutation

so it was all about this.
"animals of each kind being not less than 10" <---what was the use of this sentence then


friendship is tan 90°.

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#10 2014-04-01 17:04:58

Agnishom
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From: The Complex Plane
Registered: 2011-01-29
Posts: 15,211
Website

Re: permutation

Since the title is 'permutation', I am assuming that the order matters.

For Each stall , you can do it in 3 ways (i.e, one of cows or calves or horses)

For 10 stalls, you can do it in 3^10 Ways


'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'
'Humanity is still kept intact. It remains within.' -Alokananda

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#11 2014-04-01 17:09:58

Agnishom
Real Member
From: The Complex Plane
Registered: 2011-01-29
Posts: 15,211
Website

Re: permutation

niharika_kumar wrote:

so it was all about this.
"animals of each kind being not less than 10" <---what was the use of this sentence then

I do not know but who cares?


'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'
'Humanity is still kept intact. It remains within.' -Alokananda

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#12 2014-04-01 17:17:27

niharika_kumar
Member
From: Numeraland
Registered: 2013-02-12
Posts: 894

Re: permutation

hmmm, this sentence confused me.

thanks. smile


friendship is tan 90°.

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#13 2014-04-01 17:30:30

Agnishom
Real Member
From: The Complex Plane
Registered: 2011-01-29
Posts: 15,211
Website

Re: permutation

It means that the pool from which you are choosing animals has atleast 10 of each of those animals


'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'
'Humanity is still kept intact. It remains within.' -Alokananda

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#14 2014-04-01 20:32:37

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 82,991

Re: permutation

hmmm, this sentence confused me.

Confused me too.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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#15 2014-04-02 13:02:56

eigenguy
Member
Registered: 2014-03-18
Posts: 78

Re: permutation

I believe the intent is:
The ship can be loaded with 10 animals.
Animals available to be loaded consist of three types: Cows, calves, horses.
There are enough of each type of animal available to fill all 10 stalls with cows, or all 10 with calves, or all 10 with horses, if you desired.
Individual cows are not distinguishable from each other (so exchanging one cow for another does not constitute a different loading). The same is true of calves, and of horses.
However, and I base this only on the answer provided, not something that made it clear in the problem, the individual stalls are distinguished (so having a cow in #1 and a horse in #2 is a different loading from having a horse in #1 and a cow in #2, even if all the other stalls are the same).

Based on that understanding, the type of animal in each stall is independent from the types in the other stalls, and there are exactly 3 ways to fill each stall, so the total number of loadings is 3*3*3*...*3 = 3^10.


"Having thus refreshed ourselves in the oasis of a proof, we now turn again into the desert of definitions." - Bröcker & Jänich

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#16 2014-04-03 17:03:11

niharika_kumar
Member
From: Numeraland
Registered: 2013-02-12
Posts: 894

Re: permutation

it makes it much clearer.


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