Find the cardinal number of the indicated set. Use the cardinal number formula. If n(B)=24, n(A ∩ B)=5 , and n(A∪ B)=42, find n(A).
A. 23
B. 18
C. 25
D. 21

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24-06-2024
Mathematics

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Find the cardinal number of the indicated set. Use the cardinal number formula. If n(B)=24, n(A ∩ B)=5 , and n(A∪ B)=42, find n(A).
A. 23
B. 18
C. 25
D. 21

Sagot :

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