Question
Fri April 09, 2010 By:

If A = {3, 5, 11}, B = {2, 7, 9} then n(A union B) =

Expert Reply
Sat April 10, 2010

A U B={3,5,11,2,7,9}

So

n(AUB)=6....... i.e. the number of elements of the set AUB is 6.

alt method

n(AUB)=n(A)+n(B)-n(A intersection B)

but in this case, A int B is an empty set.

so n(A int B)=0

so y this formula also you get answer

3+3-0=6

so n(AUB)=6

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