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the average height of students in section A and B is 172
the average height of students in section A and B is 172
the average height of students in sections B and C is 167cm
the average height of students in section A and C is 177,
the average height of all the students in the sections A,B and C can be
a) 168.5
b) 169.3
c) 173.9
d) 174.8
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