The answer depends on which number is missing. Even if the location of the gap is know, there are infinitely many possible solutions. The solutions listed below are polynomials of the lowest degree.
First:
5 using the rule Un = (-4n3 + 48n2 - 128n + 99)/3
Second:
0 using the rule Un = (-7n3 + 84n2 - 209n + 138)/6
Third:
21.666 (recurring) using the rule Un = (3n3 - 23n2 + 84n - 61)/3
Fourth:
50 using the rule Un = (-11n3 + 90n2 - 121n + 48)/6
Fifth:
65 using the rule Un = (-4n3 + 36n2 - 44n + 15)/3
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64 It is a series of cubes 13, 23, 33, 43, 53 etc
The sequence appears to be decreasing by 3, then increasing by 3. Following this pattern, starting from 33, if we subtract 3, we get 30. Thus, the missing number is 30. The complete sequence would be 33, 30, 24, 27.
64 because the series is 13, 23, 33, 43, 53, 63
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.
Arithmetic- the number increases by 10 every term.