Question

If n(A)=5,n(B)=7, n(An B)=4then find n(AUB).​

Answer 1

Answer:

n(A U B) = 8

By. the formula n(AUB) = n(A)+n(B)- n(AnB)

Answer 2

Answer:

We know that,

=》n(A union B)=n(A)+n(B)-n(A intersection B)

Here,

n(A)=5

n(B)=7

n(A intersection B)=4

By substituting the above values we get,

=》n(A union B)=5+7-4

=》n(A union B)=12-4

=》n(A union B)=8

The correct answer is 8.

I hope it is helpful.

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