What is the maximum number of positive integers less than 60 that can be chosen so that the greatest common factor of every pair of them is 1 ?
A.
17
B.
18
C.
19
D.
20
Exam No：2022 First Round Grade 7 Year：2022 Question No：25
Answer:
B
Knowledge points:
G7 - Number Theory - Prime & Composite Numbers
Solution:
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