if n(A)=3 and n(B)= 6, and A is a subset of B, then n(A U B)=
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if n(A)=3 and n(B)= 6, and A is a subset of B, then n(A U B)=
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Step-by-step explanation:
n(A)=3 n(B)=6
A is a subset of B
Then n(AnB)=n(A)=3
n(AuB) =n(A)+n(B)-n(AnB)
=3+6-3
=6