Give a quick stream of consciousness before answering the following question. Fill in the blank with the correct number in this number series: 5, 15, 7, 12, __, 9, 11,... ?\nOptions:\n(A) 6\n(B) 9\n(C) 8\n(D) 7\n(E) 5
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In this simple alternating subtraction and addition series; The first series begins with 5 and adds 2; the second begins with 15 and subtracts 3, and so on.
The answer: (B).
Assistant