factorial math?
I need help with factorial i forgot how to do as 0! I know the answers as that there is 1 but as 6c6 is equal to 1 and 6P6 equivalent to 720 i dont understand please help
NCR = No! / (Nr)! * R! NPR = n! / (Nr)! 6c6 = 6! / 0! * 6! 1 = 6P6 = 6! / 0! = 6 * 5 * 4 * 3 * 2 * 1 = 720
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