For how many one-digit whole numbers greater than 0 is the product of the whole number and all its factors a two-digit number?
A.
0
B.
2
C.
3
D.
4
Exam No：2020 First Round Grade 4 Year：2020 Question No：24
Answer:
C
Knowledge points:
G4 - Number Theory - Factors & Multiples (Listing)
Solution:
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