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¿Question #222380?
TomTi89: 0! = 1?

MABBY: This is true, if my university statistics course and my failing memory of it have anything to say about things.
pricero1: I know what ! does to a number, but what does ? do?
Fribian: Been too long for me on the math, but looks like Tres De had it.
imyourskribe: rvalue on the left side >:[
mr3d: sure. n! = n * (n-1)! If we want 1!=1 then 0! MUST be 1. It has no other choice what so ever.