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The first 3 digit integer being a positive multiple of 30 is 120.

The final 3 digit integer being a positive multiple of 30 is 990.

990 - 120 = 870.

870 ÷ 30 = 29

But, as 29 is the difference between the two limits and the limits themselves are included then there are 29 + 1 = 30 such numbers.

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Q: How many 3 digit positive multiples of 30 are there?
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