# CAT 2013 | Question: 15

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Some persons are standing at distinct points on a circle, all facing towards the center. Each possible pair of persons who are not adjacent sing a three-minute song, one pair after another. If the total time taken by all the pairs to finish singing is $1$ hour, find the number of persons standing on the circle

1. $5$
2. $7$
3. $9$
4. $8$

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