At 1, 2, 3 Among the 1000 natural numbers of 1000, the natural numbers that can be divisible by 3,5 but cannot be divisible by 15

3, 6, 9 999——333
Can be divided by 5, 5, 10, 15 1000,——200
Can be divided by 15, 15, 30 990——66
333+200-66*2=401

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