3.
Ignore the 8's in the sequence and you get 9, 6, 4, 3,_.
9-3=6
6-2=4
4-1=3
3-0=3
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64
The missing number in this sequence is 64, or 4 raised to the third power. You find the answer by noting that each number in the sequence is a counting number starting at 1 that is raised to the third power. For example, 2 raised to the third power (2 x 2 x 2) is 8.
The sequence interval is 2 4 6 8 ( this is the difference of number). so the missing number is -1 if I'm not mistaken.
64 because it is basically cube each number in a row.
14