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UPSC Civil ServicesPrelims2022General Studies Paper II (CSAT)
Question
QQ77. There are 9 cups placed on a table arranged in equal number of rows and columns out of which 6 cups contain coffee and 3 cups contain tea. In how many ways can they be arranged so that each row should contain at least one cup of coffee?
Options
- A 18
- B 27
- C 54
- D 81
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Correct Answer
D 81
Model Answer
Answer: option D, as per UPSC's final answer key (Series A).