UPSC Prelims 2025 · CSAT (Paper 2) · Q25
Basic Numeracy
Hard · Number theory: divisibility (inclusion-exclusion)
Consider the first 150 natural numbers. How many of them are not divisible by any one of 2, 3, 5 and 11?
UPSC Prelims 2025 · CSAT (Paper 2) · Q25
Hard · Number theory: divisibility (inclusion-exclusion)
Consider the first 150 natural numbers. How many of them are not divisible by any one of 2, 3, 5 and 11?