First slide

Operations on Sets

Question

If n(X) = 28, n(Y) = 32, $n (X \cup Y) = 50$ then $n (X \cap Y) =$

Easy

A

6
B

7
C

8
D

10

Solution

$n (X \cap Y) = n (x) + n (Y) - n (X \cup Y)$
= 28 + 32 - 50 = 10

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