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How many natural numbers up to 2001 are divisible by 3,4 but not by 5? a) 768 b) 801 c) 934 d) 1067 Sol: Divisible by 3 till 2001 = 667 Divisible by 4 till 2001 = 500 Divisible by 12 till 2001 = 166 ⇒ Divisible by 3, 4 = 667 + 500 – 166 = 1001
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