there are 21 multiples.
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infinite; positive are 9
To find the positive integers less than 2009 that are divisible by 28 but not by 12, we need to find the multiples of 28 that are not multiples of 12. The least common multiple of 28 and 12 is 84, so we need to find multiples of 28 that are not multiples of 84. Since 28 = 2^2 * 7 and 84 = 2^2 * 3 * 7, the multiples of 28 that are not multiples of 84 are those that have an odd power of 2. The highest multiple of 28 less than 2009 that satisfies this condition is 1976. Therefore, there are 1976 / 28 = 71 positive integers less than 2009 that are divisible by 28 but not by 12.
6 of them
4 8 12 16 20 24
what are the multiples of 5
infinite; positive are 9
Leaving out non-positive multiples, the answer is 5, 10, 15 and 20.
Here are all 13 of them: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195
That would be equal to the sum of all positive integers less than 1000 minus the sum of all positive multiples of three that are less than 1000. That would be equal to: (1000 + 1) * (1000 / 2) - 3 * (333 + 1) * (333 / 2) = 1001 * 500 - 1000 * 166.5 = 500500 - 166500 = 334000
6 of them
8, 16, 24, 32, 40, 48.
4 8 12 16 20 24
109 whole numbers greater than 9 and less than 999 are multiples of 9
11 of them.
10
Nine.
There are ten different integral multiples of 10 that are equal or less than 100.