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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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