What Comes Next In The Sequence: 3, 9, 5, 12, 7, 15, 9, 18, ?, ?

Look at the series of numbers mentioned in the riddle and find the connection between the numbers.

What comes next in the sequence:

3, 9, 5, 12, 7, 15, 9, 18, ?, ?

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The listed numbers actually contains 2 alternate series;

3, 5, 7, 9 &

9, 12, 15, 15

So in the first sequence the numbers are increased by 2 & in the second sequence the number are increased by 3.

So the next 2 numbers will be as;

9 + 2 = 11 &

18 + 3 = 21.

Answer = 11, 21.