Question 125
4 blue, 10 green and several (at least one) red points are marked on a plane. All points are distinct. It is known that the sum of the distances between the red points and the blue points is $21$, the sum of the distances between the red points and the green points is $2$.
Can the sum of the distances between the blue points and the green points be equal to
a) $20$?
b) $18$?
Can the sum of the distances between the blue points and the green points be equal to
a) $20$?
b) $18$?