Question: 1. (True or False) n (A) + n(B) = n (A B) + n (A B). 2. The empty set is a subset

1. (True or False) n (A) + n(B) = n (A ∩ B) + n (A ∪ B).
2. The empty set is a subset of every set.
3. Explain why n # (n - 1)! = n!.
4. Use the result in Exercise 73 to explain why 0! is defined to be 1.

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