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what does the ! mean in math

 Feb 23, 2017
 #1
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In math ' ! ' is the FACTORAL SIGN

Examples:

5 !  = 5 x 4 x 3 x 2 x 1  = 120

3! = 3 x 2 x 1               = 6

 Feb 23, 2017
 #2
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Thanks, I didn't know that either. :)

MysticalJaycat  Feb 23, 2017

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