How many integers between 100 and 1000 have exactly two 2 s and no 3 s as digits?
A.
23
B.
24
C.
26
D.
27
Exam No：2020 First Round Grade 7 Year：2020 Question No：17
Answer:
A
Knowledge points:
G7 - Combinatorics - Basic Combinatorics (Listing & Casework)
Solution:
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