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Mathematics for IGCSE & O level - Sets (Section 2 - No. 14)

What is the value of n(A ∪ B) if n(A) = 10, n(B) = 8, and n(A ∩ B) = 3?
15
18
19
21

Forklaring

Use the formula: n(A ∪ B) = n(A) + n(B) - n(A ∩ B) => 10 + 8 - 3 = 15.

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