Friday 10 January 2014

SETS B1



If n(A)= 130 , n(B)= 120 and n(AnB)=170, find n(AuB).

Solution

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

             = 130 + 120 – 150

             = 250 – 170

             = 80

Hence n(AuB) = 80 answer

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