The average of {1,2,3,4,5} is 3 so the answer is 3*4 = 12.
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The first 5 multiples of 1 are: 1, 2, 3, 4, and 5.
1, 2, 3, 4, 5.
They are the first three multiples of LCM(5, 9), that is, the first three multiples of 45.
3, 6, 9, and 12 are the first four integer multiples (products of 1, 2, 3, 4). 6, 9, 12, and 15 are the first four prime multiples (products of 2, 3, 4, 5).
60 and its multiples