0!

Hey /sci/ I usually don't lurk here but I have a question for you guys.


I don't understand how 0! = 1
I need to write a proof using "n" as a variable and without using zero in the actual proof but I'm completely stumped.

Can someone please explain this to me??

Incorrect. I applied the formula 1!=1 inline on the left,  then moved the 1* to the left side, illustrated as a division by one. Send an e-mail to the professor who gave me this proof, if you don't believe me. His email is above.