The multiple of 3 nearest to and below 1000 is 999.
999/3 = 333
The sum of all the multiples is 3 x 333 x 334/2 = 166833
The multiple of 5 nearest to and below 1000 is 995.
995/5 = 199
The sum of all the multiples is 5 x 199 x 200/2 = 99500
Chat with our AI personalities
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
All multiples of 3 have digits that add up to a multiple of 3. There are 333 multiples of 3 between 1 and 1000.
All multiples of 3 have digits that add up to a multiple of 3. There are 333 multiples of 3 between 1 and 1000.
There are infinitely many multiples of 9 and it is not possible to add them all.
The sum is 10,000