That's an infinite list that starts off with 56, 112, 168 and so on.
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The LCM of the given three numbers is 168
The prime numbers from 1 to 8 are 2, 3, 5 and 7.
7 and 8
Oh, what a lovely question! To find the average of those numbers, you simply add them all together and then divide by how many numbers there are. So, for 6, 7, and 8, you would add them (6 + 7 + 8 = 21) and then divide by 3 (since there are 3 numbers), giving you an average of 7.
The LCM of the numbers 4, 7, and 8 is 56.