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
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17. The numbers are being increased by odd numbers beginning with 3.
26
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 sequence is formed by dividing the previous number by 2 then adding 2. 100/2 = 50, 50 + 2 = 52 52/2 = 26, 26 + 2 = 28 28/2 = 14, 14 + 2 = 16 16/2 = 8, 8 + 2 = 10 The next number in the sequence is thus :- 10/2 = 5, 5 + 2 = 7
26. The sequence can be seen either as decreasing multiples of 13 or, more generally, 65 - 13n where n = 1, 2, 3, ...