My iPod played 10 different songs in random order, then played the same 10 songs in random order again. At most how many songs did I listen to in order to hear any one of my 3 favorites of the 10 played twice?
A.
13
B.
17
C.
18
D.
20
Exam No：2020 First Round Grade 4 Year：2020 Question No：23
Answer:
C
Knowledge points:
G4 - Number Sense - Logical Reasoning (Extreme Cases)
Solution:
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