They are the first three multiples of LCM(5, 9), that is, the first three multiples of 45.
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The 3 first multiples of 75 are: 1, 3, and 5.
The first 5 multiples of 1 are: 1, 2, 3, 4, and 5.
The first three multiples of 3 and 5 are 15, 30 and 45.
1, 2, 3, 4, 5.
The first five common multiples are the first five multiples of the lowest common multiple. lcm(5, 6): 5 = 5 6 = 2 x 3 → lcm = 2 x 3 x 5 = 30 → first 5 common multiples of 5 and 6 are: 30 x 1 = 30 30 x 2 = 60 30 x 3 = 90 30 x 4 = 120 30 x 5 = 150