The list comprises the first 4 numbers of the sequence:
Un = -5n3 + 45n2 - 127n + 126 for n = 1, 2, 3, ...
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39 . . .
39-15+18 6x3 Answer: 25
15
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45.
As the ins are increasing by 1, the outs are increasing by 3. 7 Double + 1 = 15 8 Double + 2 = 18 9 Double + 3 = 21 10 11 12 13 14 15 Double + 9 = 39
mean(18, 23, 39, 10, 22, 17, 16, 15) = (18 + 23 + 39 + 10 + 22 + 17 + 16 + 15) ÷ 8 = 160 ÷ 8 = 20
18, 23, 10, 39, 22, 17, 16, 15 Mean = (18 + 23 + 10 + 39 + 22 + 17 + 16 + 15)/8 = 20 Lowest Number in set is 10 Highest Number in set is 39 Range = (39 - 10) = 29
It is: 3
3 6 9 12 15 18 21 24 27 30 33 36 39 42...
The next number could be 26 The next number could be 12 - - - - - - - - - The next number that is in the sequence is 12.
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 516, 12, 18, 24, 30, 36, 42, 48, 5416, 32, 48, 64The LCM is 48.
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42 . . .