Question 471 of 480

If n(P) = 20, n(Q) = 30, and n(P ∪ Q) = 40, find n(P ∩ Q).

  • 10
  • 30
  • 15
  • 40

Correct Answer: A

Explanation
Use the formula: n(P ∪ Q) = n(P) + n(Q) - n(P ∩ Q). 40 = 20 + 30 - n(P ∩ Q) → 40 = 50 - n(P ∩ Q) → n(P ∩ Q) = 10.
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