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T or F and explanation 1. A ∩ ∅ = A 2. The number of (ordered)...

T or F and explanation

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)
Math   Statistics-And-Probability   
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