In the figure on the right, please put digits 1-7 in the seven circles so that the three digits in every straight line add up to 12 . What is the digit in the middle circle?
A.
3
B.
4
C.
5
D.
6
Exam No：2018 First Round Grade 3 Year：2018 Question No：16
Answer:
B
Knowledge points:
G3 - Algebra - Logic Puzzles
Solution:
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