First slide

Operations on Sets

Question

If n(A) = 50, n(B) = 20 and $n (A \cap B) = 10$ then $n (A Δ B)$ is

Moderate

A

50
B

60
C

70
D

40

Solution

$n (A Δ B) = n (A \cup B) - n (A \cap B)$
$= n (A) + n (B) - 2 n (A \cap B) = 50$

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