3 and then there are other possible functional relationships.
There is only one polynomial of degree 3 and that is
Un= (2n3- 15n2+ 19n + 12)/3 where n = 1, 2, 3, ...
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The answer for the number that follows the sequence 4-6-3-7-9-6-10 is 12. The pattern is +2,-3,+4,+2,-3,+4,.....,+2,-3,+4,...
The missing numbers in the sequence 2 3 4 6 are 5 and 7.
18. The pattern is 3+1=4, 4+2=6, 6+3=9, 9+4=13, so 13+5=18
18 b/c the pattern is +1,+2,+3...
-1,-2,+2,-4,+4,-5,+5, +0. the sequence is subtract twice, add once, subtract again, add, then subtract, then add twice.