For how many whole numbers between 100 and 1000 is the sum of the digits of the whole number equal to 20 ?
A.
21
B.
28
C.
36
D.
45
Exam No：2020 First Round Grade 5 Year：2020 Question No：24
Answer:
C
Knowledge points:
G5 - Data - Systematic Listing & Combinations
Solution:
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