How many questions on Number System (Unit Digit) have appeared in UPSC exams?

A total of 3 UPSC questions on Number System (Unit Digit) have been asked across different years and paper types on LearnPro.

Is Number System (Unit Digit) important for UPSC Prelims?

Yes. Number System (Unit Digit) has been tested 3 times in UPSC exams based on our PYQ data. It falls under the Basic Numeracy section and is a recurring topic.

UPSC Number System (Unit Digit) — Previous Year Questions

All 3 UPSC questions on Number System (Unit Digit) from 2023 to 2025 — with answers and detailed explanations.

2025(1 questions)

Prelims · CSAT

Q30. What is the unit digit in the multiplication of 1 × 3 × 5 × 7 × 9 × … × 999?...

2024(1 questions)

Prelims · CSAT

Q17. 17. What is the rightmost digit preceding the zeros in the value of 30^30 ?...

2023(1 questions)

Prelims · CSAT

Q38. What is the unit digit in the expansion of (57242) 9×7×5×3×1 ?...

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