Question

Given that n(A)=15, n(B)=12, and n(A ∪ B)=17, what is n(A ∩ B)?

Answer 1

\[n(A\cup B)=n(A)+n(B)-n(A\cap B)\]

plug in your numbers and solve

Answer 2

even for the n(A∪B) and n(A∩B)

Answer 3

plug in the numbers you have...

\[n(A\cup B)=n(A)+n(B)-n(A\cap B)\]

\[17=15+12-n(A\cap B)\]

now solve for the uinknown.

Answer 4

*unknown

Answer 5

So the answer would be 10?

Answer 6

yes