Catalyst University Math: Simple Proof That Zero Factorial (0!) Equals 1

The video tutorial explains the concept of factorials, starting with basic examples like 5! and 7!. It then derives a general formula for N factorial, showing how to expand it. The tutorial simplifies factorial expressions using N-1 factorial and concludes by explaining why 0 factorial is equal to 1.

Explain the relationship between N factorial and (N-1) factorial.

What conclusion is drawn about 0 factorial in the text?