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Sets A and B have 2 as the intersection. universal set is {2,3,4,5,6,7,8,9}

n(U)= 8

n(A)=?

n(B)=5

therefore, n(U)=n(A)+n(B)

8=5+?, subtract 5 from both sides

8-5=5-5+?

3=n(A)

So what is the answer? I am confused. Here are the multiple choice answers below:

A. 4

B.14

C. 8

D. 17

E. 5

F. 1

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