What should be the answer for A=3? Should it be 3 or 5?

# What should be the answer for A=3? Should it be 3 or 5?

It will be 5, Suppose points are numbered 1, 2, 3, 4, 5, 6 clockwise, then

[1-2, 3-6, 4-5], [4-5, 1-6, 2-3], [6-5, 3-4, 1-2], [6-5, 4-1, 2-3], [3-4, 2-5, 1-6]