Ignoring the "9" , then this is a Fibonacci sequence.
2,2,4,6,10
The first two terms are 'seed' terms then successive terms equal the sum of the two previous terms.
2 + 2 = 4
2 + 4 = 6
4 + 6 = 10
The next term would be 6 + 10 = 16.
10
10, 8, 6, 4, 2, 0, -2, -4
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,...
5
Each subsequent number in this sequence is 2 less than the previous. It is extremely likely that the next number in this sequence is 2.
10
10, 8, 6, 4, 2, 0, -2, -4
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,...
It is negative 2.
5
16
42, each number in the sequence is the addition of the previous two: 2-2-4-6-10-16-26 2+2=4 4+6=10 6+10=16 10+16=26 16+26=42
The answer depends on where the missing number is meant to be. If 2, 4, 6, 10, 26, X: then X = 72 If 2, 4, 6, 10, X, 26: then X = 16.8 If 2, 4, 6, X, 10, 26: then X = 6.6 If 2, 4, X, 6, 10, 26: then X = 5.4 If 2, X, 4, 6, 10, 26: then X = 1.2 If X, 2, 4, 6, 10, 26: then X = 6
6 and 10
Each subsequent number in this sequence is 2 less than the previous. It is extremely likely that the next number in this sequence is 2.
10
Un = 2n + 2 is one possible answer.