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If A and B are not disjoint sets, then n...

If A and B are not disjoint sets, then `n(A uu B)=`

A

1.`n(A)+n(B)`

B

2.`n(A)+n(B)-n(A nn B)`

C

3.`n(A)+n(B)+n(A nn B)

D

4.`n(A) . n(B)`

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The correct Answer is:
B
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