Insert the missing number
3, 7, 6, 5, 9, 3, 12, 1, 15, ... Choose the correct option:
A) 18 B) 33 C) -1 D) 3 E) -3
3, 7, 6, 5, 9, 3, 12, 1, 15, ... has two different series   1) 3, 6, 9, 12, 15.....   2) 7, 5, 3, 1, ..... -1 is the next number   ANSWER:-1
<result>C</result>
Insert the missing number
3, 7, 6, 5, 9, 3, 12, 1, 15, ...