Then, it's actually x you obtain since there is no n variable for y = x! You only have x and y.
Chat with our AI personalities
Zero factorial is one because n! = n-1! X n. For example: 4! = (4-1) X 4. If zero factorial was zero, that would mean 1! =(1-1) X 1 = 0 X 1=0. Then if 1!=0, then even 999! would equal zero. Therefore, zero factorial equals 1.
It's the concept of multiplicative identity, also called unity: for any number N, N x 1 = N.
Let the number be n. We have: 3 x 1/n = 9 x 1/6 (simplify) 3 x 1/n = 3 x 1/2, this is true only for n = 2.
3
3 6