Squaring alone would work if you looked at the odds of both people being nice. If 90% of the population is nice, squaring it would give you 81% of pairings bein

Squaring alone would work if you looked at the odds of both people being nice. If 90% of the population is nice, squaring it would give you 81% of pairings being nice, which matches the above example. Just have to take the glass half full perspective.