If each of 4 rams in a pen butted heads with every other ram once, there were ? head-butts. (Two rams head-butting is 1 head-butt.)
A.
12
B.
8
C.
6
D.
4
Exam No：2022 First Round Grade 4 Year：2022 Question No：14
Answer:
C
Knowledge points:
G4 - Number Sense - Systematic Counting
Solution:
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