A certain number has exactly 3 different factors. If the second greatest factor is 7 , what is the sum of the digits of the number?
A.
5
B.
7
C.
12
D.
13
Exam No：2020 First Round Grade 4 Year：2020 Question No：33
Answer:
D
Knowledge points:
G4 - Number Theory - Factors & Multiples (Listing)
Solution:
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