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Solve if you can -
In a room filled with 7 people, 4 people have exactly 1 sibling in the room and 3 people have exactly 2 siblings in the room. If two individuals are selected from the room at random, what is the probability that those two individuals are NOT siblings?
- 5/7
- 4/7
- 3/7
- 5/21
- 16/21
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