Need help with finite mathematics

label Mathematics
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Nov 15th, 2015

Thank you for the opportunity to help you with your question!

Apply the formula  n(A U B) = n(A) + n(B) - n(A n B)

we want to solve for n(B)

Plug in the numbers.  Where n(A U B) = 18,  n(A) = 12, n(A n B) = 8

18 = 12 + n(B) - 8

18 = 4 + n(B)

n(B) = 14

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 15th, 2015

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