9514 1404 393
Answer:
a) n(A∪B) = 20
b) n(A) = 31
Step-by-step explanation:
The relevant formula is ...
n(A∪B) = n(A) +n(B) -n(A∩B)
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a) n(A∪B) = 5 +18 -3 = 20
b) 32 = n(A) +14 -13 ⇒ n(A) = 31
