If n(A)= 60 , n(B)= 90 and n(AuB)= 130,
find n(AnB).
Solution
n(AuB) = n(A) + n(B) - n(AnB)
130 = 60 + 90 - n(AnB)
130 = 150 - n(AnB)
130 - 150 = - n(AnB) [after
transferring 150 on the left hand side]
-20 = -n(AnB)
n(AnB) = 20 [after dividing by -1 both
sides]
Hence n(AnB) = 20 answer
TRY THIS………….
If n(A)= 74 , n(B)= 86 and n(AuB)= 125,
find n(AnB).
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