Factorial Calculator

• 10! counts the number of distinct orderings (permutations) of 10 items.
• 10! ends in 2 trailing zeros (each zero comes from a factor of 10 = 2 x 5; fives are counted by Legendre's formula).
• This result fits within standard exact-integer precision, so every digit is shown.
• Factorials grow faster than any exponential: each step multiplies by the next whole number.

Next stepUse n! in permutation (nPr = n!/(n-r)!) and combination (nCr = n!/(r!(n-r)!)) formulas.