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UPSC Civil ServicesPrelims2025General Studies Paper II (CSAT)
Question
QQ20. What is the unit digit in the multiplication of 1 × 3 × 5 × 7 × 9 × ... × 999 ?
Options
- A 1
- B 3
- C 5
- D 9
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Correct Answer
C 5
Model Answer
Answer: option C, as per UPSC's final answer key (Series A).