Each of the ordered pairs $$\((3,4)\)$$ and $$\((12,3)\)$$ has a least common multiple of 12 . All together, how many ordered pairs of positive integers have a least common multiple of 12 ?

A.
16
B.
15
C.
14
D.
13
Mathematics
Competition
Math League
Exam No:2022 First Round Grade 7 Year:2022 Question No:24

Answer:

B

Knowledge points:

G7 - Number Theory - Prime Factorization

Solution:

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