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Best answer by StuartBruff
@-MFra- wrote:

I have the impression that you are making confusion. The double factorial is not the factorial of the factorial of n. On Wiki ... there is a broad description.

The number that you show fact2(3) evaluating to is actually (4!)! (620448401733239000000000).   (10!)! is monstrously long.

 

Do you have anything else defined earlier in your worksheet that might affect the result?

 

Cheers,

 

Stuart

 

2 replies

A
AlanStevens19-Tanzanite
19-Tanzanite
June 22, 2020

Works for me in M15:

 

g0.jpg

If I try   fact2(10)=    I get the error message "This variable is not defined".  (It's symbolic only)

 

Alan

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-MFra-21-Topaz IIAuthor
21-Topaz II
June 22, 2020

I also use M15.

L
LucMeekes23-Emerald IV
23-Emerald IV
June 22, 2020

Appears to be wrong, see also:https://www.maplesoft.com/support/help/Maple/view.aspx?path=factorial

 

LucMeekes_0-1592822823434.png

Success!
Luc

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-MFra-21-Topaz IIAuthor
21-Topaz II
June 22, 2020

I have the impression that you are making confusion. The double factorial is not the factorial of the factorial of n. On Wiki ... there is a broad description.

S
StuartBruff23-Emerald VAnswer
23-Emerald V
June 22, 2020
@-MFra- wrote:

I have the impression that you are making confusion. The double factorial is not the factorial of the factorial of n. On Wiki ... there is a broad description.

The number that you show fact2(3) evaluating to is actually (4!)! (620448401733239000000000).   (10!)! is monstrously long.

 

Do you have anything else defined earlier in your worksheet that might affect the result?

 

Cheers,

 

Stuart

 

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