32
The rule is to add 3n, where n is the number of the number in the series. (add 3, 6, 9, 12).
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10 4 3 11 15 9 8 16 20....
The next number in the series 1 2 4 8 10 20 22 is
65 is the next number
The series is a sequence of three numbers, the second number is 3 greater than the first, and the third number is 5 greater than the second. (or 8 greater than the first) 20 + 3 = 23 : 23 + 5 = 28 14 + 3 = 17 : 17 + 5 = 22 11 + 3 = 14........is therefore the next number in the sequence.
26