Saturday, 11 January 2014

SETS B4



If n(A)= 40 , n(B)= 90 and n(AnB)=20, find n(AuB).

Solution

n(AuB) = n(A) + n(B) - n(AnB)

             = 40 + 90 – 20

             = 130 – 20

             = 110

Hence n(AuB) = 110 answer

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