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 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? 

5/21
3/7
4/7
5/7
16/21
1 answer
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 Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top of the lighthouse is observed from the ships are 30º and 45º respectively.  If the lighthouse is 100 m high, the distance between the two ships is

300m
173m
273m
200m
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