Q1. Given a collection of points P in the plane, a 1-set is
a point in P that can be separated from the rest by a line,
.i.e the point lies on one side of the line while the others
lie on the other side.
The number of 1-sets of P is denoted by n1(P). The minimum
value of n1(P) over all configurations P of 5 points in the
plane in general position(.i.e no three points in P lie on a
line) is
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