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2.6.1  The factorial : factorial

Xcas can manage integers with unlimited precision, such as the following:
Input :

factorial(100)

Output :

   9332621544394415268169923885626670049071596826438162
   1468592963895217599993229915608941463976156518286253
   697920827223758251185210916864000000000000000000000000

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