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Question:
2013 Fall Midterm - 4
Author: Pat Morin
In a group of 20 people,
6 are blond,
7 have green eyes,
11 are not blond and do not have green eyes.
How many people are blond and have green eyes?
(a)
$9$
(b)
$4$
(c)
$5$
(d)
$3$
COMP 2804: Discrete Structures II
The Principle of Inclusion and Exclusion (3.5)