Constraint: The produced set must have at least 2 elements inside
For example, for n choose r,
where n is 4 is 2.
(1,2) and (3,4) or (1,3) and (2,4) or (1,4) and (2,3)
where n is 3 is 1,
(1,2) or (1,3) or (2,3)
It’s combinatorics problem and I am trying to find the formula.
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