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Mathematics, 01.08.2019 04:20 10040813

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?
a. 5/21 b. 3/7 c. 4/7 d. 5/7 e. 16/21

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