1.

If `n(A)=8, n(B)=6` and the sets A and B are disjoint, then find `n(A uu B)`.

Answer» Given n(A)=8 and n(B)=6.
A and B are disjoint `rArr A cap B = phi rArr n(A cap B)=0`
`therefore n(A cup B)=n(A) +n(B)-n(A cap B)=8 +6 -0 = 14`


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