If n(A) = 6, n(A ∪ B) = 8, and n(B) = 5,  then what is  n(A ∩ B)?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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If n(A) = 6, n(A ∪ B) = 8, and n(B) = 5,

 then what is 

n(A ∩ B)?

 

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Let A and B be any two events , the union of two events is defined as,

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