How many questions on Number System (HCF/LCM) have appeared in UPSC exams?

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

Is Number System (HCF/LCM) important for UPSC Prelims?

Yes. Number System (HCF/LCM) has been tested 3 times in UPSC exams based on our PYQ data. It falls under the Quantitative Aptitude section and is a recurring topic.

UPSC Number System (HCF/LCM) — Previous Year Questions

All 3 UPSC questions on Number System (HCF/LCM) from 2024 to 2025 — with answers and detailed explanations.

2025(1 questions)

Prelims · CSAT

Q77. Let P = QQQ be a 3-digit number. What is the HCF of P and 481?...

2024(2 questions)

Prelims · CSAT

Q18. 18. 421 and 427, when divided by the same number, leave the same remainder 1. How many numbers can be used as the divisor in order...

Prelims · CSAT

Q19. 19. A can X contains 399 litres of petrol and a can Y contains 532 litres of diesel. They are to be bottled in bottles of equal si...

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