Select the number that can replace the question mark (?) in the following series.
40, 37, 43, 34, 46, ?
The series follows the pattern as,
40 - 3 = 37
37 + 6 = 43
43 - 9 = 34
34 + 12 = 46
46 - 15 = 31
$$\therefore$$ The correct answer is option A.
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