From 6 unique pies, I can pick different possible combos of 3 pies.
A.
18
B.
20
C.
40
D.
120
Exam No：2020 First Round Grade 7 Year：2020 Question No：12
Answer:
B
Knowledge points:
G7 - Combinatorics - Basic Combinatorics (Listing & Casework)
Solution:
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