If A={1,2,3,5,7} and B{2,4,6,7}, then find n(AuB)
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Step-by-step explanation:
(AUB)={1,2,3,5,7}U{2,4,6,7}
={1,2,3,4,5,6,7}
A∩B={2,7}
n(A∩B)=2
n(AUB)=n(A)+n(B)-n(A∩B)
=5+4-2
=7
For 2 marks....
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