Of the 200 pets for sale at Pip's Pets, $$\(a\)$$ have scales, $$\(b\)$$ have gills, and $$\(c\)$$ have both. How many of the pets have neither scales nor gills?
A.
\(200-a-b\)
B.
\(200-c\)
C.
\(200-a-b-c\)
D.
\(200-a-b+c\)
Exam No：2020 First Round Grades 8-9 Year：2020 Question No：7
Answer:
D
Knowledge points:
G8-9 - Combinatorics - Set Theory (Inclusion-Exclusion Principle)
Solution:
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