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Factorial

On a Casio calculator you can calculate the factorial of a natural number with the keys

  x-1

 


Example 1

To calculate 4! = 24

 4    x-1 =  4!
          24.

 


Example 2

Enter 0!

 0    x-1   =    0!
           1.

This is correct, because by definition is specified that 0! ≝ 1.

 


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