Home / Topic / LCM
Topic

LCM

Asked 2 times in EPFO over 8 years (2015–2023), peaking in 2015.
2
PYQs
1
Exams
2
Years active
2015–2023
Span
2015
Peak
2/2
Answers
📅 Full chronological timeline →

Key insights

  • Most tested in EPFO — 2 of 2 PYQs
  • Most asked in 2015
  • Recurs across 2 years (2015–2023)

Across exams

EPFO · 2

How the concept evolved

115
123
Long-running — most appearances (1 of 2) predate 2016, and it still returns.

Sample questions

You've seen the pattern — here are a few of the actual PYQs.
EPFO2023
In a desert, X and Y are two spots that are separated by 100 km. At point X, are placed two pillars, one black and one white. Along the line joining X and Y, a white pillar is placed for every 180 m and a black pillar is placed for every 350 m. How many times can one find black and white pillars together while traveling from X to Y?
  1. A 14
  2. B 15
  3. C 16 ✓
  4. D 17
✓ Correct answer: (C)
Quantitative Aptitude › Number System
EPFO2015
At a dinner party, every two guests used a bowl of rice between them, every three guests used a bowl of dal among them and every four guests used a bowl of curd among them. There are altogether 65 bowls. What is the number of guests present at the party ?
  1. A 90
  2. B 80
  3. C 70
  4. D 60 ✓
✓ Correct answer: (D)
Quantitative Aptitude › Arithmetic

Study how UPSC repeats — not just the papers

₹199 / 1 year · Founding Member

Full access unlocks the three things no PYQ PDF gives you:
① Cross-exam learning — see the same idea recur across CSE, CAPF, CDS and NDA.
② Topic evolution — how each idea is framed, year by year.
③ Question intelligence — every PYQ + answer, linked to related concepts and similar questions.

e.g. Round Table Conference: CDS 2017 → CSE 2017 → … → CAPF 2024

15 days free, no card required — then ₹199 for 1 year.

Start your 15-day free trial →
CrispUPSC · YouTube · Telegram · About · What’s New · invite-only beta
💬 Feedback

Send feedback