A and B are two sets- If nA - 20- nB - 30 and nA - B - 40- then nA - B is equal to

The correct option is B 10 Given that: n(A)=20,n(B)=30,n(A∪ B)=40 To find: n(A∩ B)=? Solution: n(A∩ B)=n(A)+n(B) n(A∪ B) =20+30 40 = ...

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Properties of Set Operation

A and B are...

Question

$A$ and $B$ are two sets. If $n (A) = 20, n (B) = 30$ and $n (A \cup B) = 40$ , then $n (A \cap B)$ is equal to

50

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40

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n (A) = 20, n (B) = 30

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A

B

n (A) = 20

n (A \cap B) = 4

n (A \cup B) = 42

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