Each of the 20 people has 19 other people to communicate to. If you add that all up you get 20*19 paths, but then each path is counted twice (back and forth), so we divide this by 2. 20*19/2 = 190.
The general forumula is n(n-1)/2
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gravitational force acting on that person.
Explanation:
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Both Flat, round discs.
A DVD can hold six times as much as compacity than a disc.
A CD is a Compact Disc.
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