Select the number that can replace the question mark (?) in the following series.
17, 20, 15, 22, 13, ?
The series follows as pattern,
17 + 3 = 20
20 - 5 = 15
15 +Â 7 = 22
22 - 9 = 13
13 + 11 = 24
$$\therefore$$ The correct answer is option D.
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