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On the fifth day of Christmas, Calvin gave to me

5 golden rings

At the registry of marriage, there were 5 couples (total of 10 people) that were waiting to get married. If we pick any two people out of these 10, what is the probability that they are a couple?

1) 15 \frac{1}{5}
2) 19 \frac{ 1}{9}
3) 110 \frac{1}{10}
4) 145 \frac{1}{45}


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