Answer
Multiples of 1800 are:
1800, 3600, 5400, 7200, 9000, 10800, 12600, 14400, 16200, 18000, 19800, 21600, 23400, 25200, 27000, 28800, 30600, 32400, 34200, 36000, 37800, 39600, 41400, 43200, 45000, 46800, 48600, 50400, 52200, 54000, 55800, 57600, 59400, 61200, 63000, 64800, 66600, 68400, 70200, 72000, 73800, 75600, 77400, 79200, 81000, 82800, 84600, 86400, 88200
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