Railway Recruitment Board Mathematics — Question 1690
Question
What is the LCM of 12, 15 and 20?
- 120
- 60
- 180
- 240
Correct answer
B — 60
Explanation (English)
12 = 2²×3, 15 = 3×5, 20 = 2²×5. LCM takes highest powers: 2² × 3 × 5 = 60.
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