On each of the four shelves of my bookcase is a different prime number of books. There could be a total of books on my shelves.
A.
15
B.
21
C.
22
D.
24
Exam No：2018 First Round Grade 6 Year：2018 Question No：16
Answer:
B
Knowledge points:
G6 - Number Theory - Odd/Even Properties
Solution:
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