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Formulas for Permutation and Combination??

Former Member

‎2009 Jul 13 7:46 AM

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1,023

Hi All,

I got a requirement to develop a Simulator for a chemical process.. In which ther will be some inputs given by the user for a process.. the output must be Optimus result or best result...

I need to know.. is ther any standard for using Permutation and Combinations..

Also is ther any feature to develop a simulation process??

Thanks and Regards

Aravindh Mani

Hi All,

I got a requirement to develop a Simulator for a chemical process.. In which ther will be some inputs given by the user for a process.. the output must be Optimus result or best result...

I need to know.. is ther any standard for using Permutation and Combinations..

Also is ther any feature to develop a simulation process??

Thanks and Regards

Aravindh Mani

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2 REPLIES 2
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Former Member

‎2009 Jul 13 7:53 AM

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679

hi,



_*FORMULA*_
Permutation = nPr = n! / (n-r)! 
Combination = nCr = nPr / r! 
where,
              n, r are non negative integers and r<=n.
              r is the size of each permutation.
              n is the size of the set from which elements are permuted.
              ! is the factorial operator.

Example:
Example:Find the number of permutations and combinations: n=6; r=4.


  Step 1: Find the factorial of 6.
            6! = 6×5×4×3×2×1 = 720

  Step 2: Find the factorial of 6-4.
            (6-4)! = 2! = 2

  Step 3: Divide 720 by 2.
            Permutation = 720/2 = 360

  Step 4: Find the factorial of 4.
            4! = 4×3×2×1 = 24

  Step 5:Divide 360 by 24.
            Combination = 360/24 = 15


The above example will help you to find the Permutation and Combination manually.

hope this helps

Regards

RItesh J

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Former Member

‎2009 Jul 13 8:13 AM

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679

Hi Ritesh,

Thanks for your reply.

I m ok with the formulas and all..

I m asking is ther any standard functionality for these formulas..

and my query is like .. these formulas gives u no of possiblities.

But i want to know which is best probability..

Eg:

i m mixing water some amount(say input from user) and some amount of heat(this too from user like 100 degrees..)..

so when the amount changes wat are the results... and ther is a standard like wat will be the boiling point of water..

U got my requirement???

Thanks n Regards

Aravindh Mani