If n(A)= 78 , n(B)= 90 and n(AuB)= 130,
find n(AnB).
Solution
n(AuB) = n(A) + n(B) - n(AnB)
130 = 78 + 90 - n(AnB)
130 = 168 - n(AnB)
130 - 168 = - n(AnB)
-38 = -n(AnB)
n(AnB) = 38 [after dividing by -1 both
sides]
Hence n(AnB) = 38 answer
TRY THIS………….
If n(A)= 71 , n(B)= 88 and n(AuB)= 130,
find n(AnB).
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