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T or F and explanation Please write clearly，thank you 1. A ∩ ∅ = A 2....

T or F and explanation
Please write clearly，thank you

1. A ∩ ∅ = A
2. The number of (ordered) lists of r objects chosen from n is C(n, r)
3. P(n, r) ≥ C(n, r)
4. If A and B are finite sets, then n(A × B) = n(A) × n(B)
5. If A and B are finite sets, then n(A ∩ B) = n(A) + n(B) − n(A ∪ B)


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