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UPSC Civil ServicesPrelims2023General Studies Paper II (CSAT)
Question
QQ54. 40 children are standing in a circle and one of them (say child-1) has a ring. The ring is passed clockwise. Child-1 passes on to child-2, child-2 passes on to child-4, child-4 passes on to child-7 and so on. After how many such changes (including child-1) will the ring be in the hands of child-1 again ?
Options
- A 14
- B 15
- C 16
- D 17
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Correct Answer
B 15
Model Answer
Answer: option B, as per UPSC's final answer key (Series A).