Hi. I know the following two questions might seem stupid, but I really need the correct answers in order to better understand the way we deal with numbers.(adsbygoogle = window.adsbygoogle || []).push({});

1. How can we prove that (0! = 1)?

We all know (4! = 4*3*2*1), (3! = 3*2*1), (2! = 2*1), (1! = 1)

But for 0, (0! = 1) doesn't make sense. Don't you agree?

2. Is number 1 a prime? Why? Why not?

Is it true that some mathematicians refuse to consider number 1 a prime?

Thanks in advance

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