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Total pair pairs are 4999950000 using (n-1)*n/2 . now,total number of pairs that person from same contry are 2 because there are 2 group of 2 person rest of are group of only single person.so answer is 4999950000-2=4999949998.
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Total pair pairs are 4999950000 using (n-1)*n/2 . now,total number of pairs that person from same contry are 2 because there are 2 group of 2 person rest of are group of only single person.so answer is 4999950000-2=4999949998.