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There are four multiples of 12 between 150 and 200: 156, 168, 180, 192
Consecutive numbers can't both be multiples of 7. The LCM of consecutive numbers is their product. 14 and 15 are consecutive numbers whose LCM is a multiple of 7 that is greater than 200.
The multiples of 7 between 200 and 400 are: 203, 210, 217, 224, 231, 238, 245, 252, 259, 266, 273, 280, 287, 294, 301, 308, 315, 322, 329, 336, 343, 350, 357, 364, 371, 378, 385, 392, 399. The sum of all the multiples of 7 between 200 and 400 is 8,729.
Any multiples of 18 that differ by 18, like 216 and 234, 234 and 252, 252 and 270, 270 and 288.
They are 105, 126, 147, 168 and 189 which makes four of them