if a={1,2,3,4,5,7,9,11},find n(A)
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Answer:
A={2,3,4,5,7}
n(A)=5
B={7,8,9}
n(B)=3
n(A∩B)=1
∴(A∪B)=n(A)+n(B)−n(A∩B)
(A∪B)=5+3−1=7
Step-by-step explanation:
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