They are the multples of 2*3 or 6. 6,12,18,... Since 2000/6 = 333.3333333... The largest multiple of 6 that does not exceed 2000 is 333*6 or 1998, so the list is 6,12,18,...,1998 If we divide every number in the list by 6, we get this list: 1,2,3,...,333 There are 333 in that list so there are also 333 in the list 6,12,18,...,1998. Answer: 333 Edwin