Look at the series of numbers mentioned in the riddle and
What comes next in the sequence;
6, 8, 11, 15, 17, 20, ?

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This simple addition series which adds 2, 3, 4 to each number to arrive at the next progressively starting with the number 6.
6 + 2 = 8
8 + 3 = 11
11 + 4 = 15
15 + 2 = 17
17 + 3 = 20
Therefore the next number will be;
20 + 4 = 24 &
24 + 2 = 26
The next 2 numbers will be = 24, 26
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24