If you have 6 different numbers and you are
asked "how much different ways of arranging these numbers are there",you could use a factorial.1 times 2 times 3 times 4 times 5 times 6=720 ways.
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x = 90 y = 89
To calculate the number of zeros in a factorial number, we need to determine the number of factors of 5 in the factorial. In this case, we are looking at 10 to the power of 10 factorial. The number of factors of 5 in 10! is 2 (from 5 and 10). Therefore, the number of zeros in 10 to the power of 10 factorial would be 2.
factorial of -1
Factorial 6 = 720
Factorial(0), or 0! = 1.