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Factorial (n!)


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#1 fvogado

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Posted 17 July 2019 - 05:51 PM

Hello I am newbie with Casio Calculators so I need a little help :) 

I am a happy owner of FX-9860gii

 

I want to solve this equation:

 

             M!

X= ---------------

      N!  x  (M-N)!

 

I know that can be solved using the Combination function (nCr ) but this is not the idea, the idea is to use X,M and N as variables.

When I try to "write" the equation I receive this answer "syntax error" but I do not know what kind of mistake I did. I wrote the equation in the same way that I wrote here.

 

If I write this equation, I do not receive the syntax error message so I think the problem is the factorial symbol (!)

 

             M

X= ---------------

      N  x  (M-N)

 

Thanks in advance.



#2 CalcLoverHK

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Posted 18 July 2019 - 04:56 AM

             M!

X= -----------------   seems have infinite solutions at all.

        N!(M-N)!



#3 fvogado

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Posted 18 July 2019 - 05:07 AM

Hello, Is not working for me...

 

 

             M!

X= -----------------   seems have infinite solutions at all.

        N!(M-N)!

 



#4 CalcLoverHK

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Posted 18 July 2019 - 05:10 AM

I tried this equation in NumWorks simulator, but it showed "The system is not linear". (Your equation is not linear I think?)



#5 fvogado

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Posted 18 July 2019 - 05:16 AM

Is the formula of the Combinations, nothing special at all. The calculator can solve it.

 

I tried this equation in NumWorks simulator, but it showed "The system is not linear". (Your equation is not linear I think?)


Is the formula of the Combinations, nothing special at all. The calculator can solve it.

 

I tried this equation in NumWorks simulator, but it showed "The system is not linear". (Your equation is not linear I think?)



#6 CalcLoverHK

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Posted 18 July 2019 - 05:24 AM

Maybe you can try X=M!÷(N!(M-N)!)?



#7 fvogado

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Posted 18 July 2019 - 05:29 AM

not working :(

 

Maybe you can try X=M!÷(N!(M-N)!)?



#8 CalcLoverHK

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Posted 18 July 2019 - 05:34 AM

Well, what variable do you want to solve?

Since this formula has infinite solutions, you have to assume the value of the variables or type the possible value range of the variable you want to solve.



#9 fvogado

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Posted 18 July 2019 - 05:41 AM

The idea is to get X,M or N if I give to the calculator 2 of them. Try the same formula without (!) and you will get the idea...

 

Well, what variable do you want to solve?

Since this formula has infinite solutions, you have to assume the value of the variables or type the possible value range of the variable you want to solve.



#10 fvogado

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Posted 29 July 2019 - 03:22 PM

Hello, nobody has any idea how to solve it?

best regards






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