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What does ! mean in math

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That is a factorial. In the event of a factorial (Let's use 6! for a nice, easy example) you would do 1*2*3*4*5*6 to get 720. You basically just multiply all numbers leading up to and including that number.

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To add to acw's answer, 0! Will equal 1, while the in the set of natural numbers it is just n(n-1)(n-2)...(1)

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Factorial

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Mathematics is the abstract study of quantity,structure,space,change,and many other topics. It has no generally accepted definition.

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