Question

# If A and B are two disjoint sets, then n(A∪B) is equal to

A

n(A)+n(B)

B

n(A)+n(B)n(AB)

C

n(A)+n(B)+n(AB)

D

n(A)  n(B)

Solution

## The correct option is B n(A)+n(B) Two sets are disjoint if they do not have a common element in them , i.e., A∩B=ϕ ∴n(A∪B)=n(A)+n(B) MathematicsRD SharmaStandard XI

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