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*The factorial of a number <math>N</math> is the product of all positive integers, less than or equal to <math>N</math>. It is calculated as -
*The factorial of a number <math>N</math> is the product of all positive integers, less than or equal to <math>N</math>. It is calculated as -
<math>N! = N X (N-1) X (N-2) X ..... 1</math>
<math>N! = N * (N-1) * (N-2) * ..... 1</math>
*<math>N</math> should be a positive integer. Else Calci displays #N/A error message.
*<math>N</math> should be a positive integer. Else Calci displays #N/A error message.