I am a lovely cat. When I multiply the digits of a whole number and the product I get is 9 , I put that whole number on my list of favorite numbers. Of the whole numbers from 1000 to 9999, how many would I put on my list of favorite numbers?
A.
5
B.
10
C.
15
D.
20
Exam No：2018 First Round Grade 3 Year：2018 Question No：33
Answer:
B
Knowledge points:
G3 - Number Theory - Factors (Basic)
Solution:
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