In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much?\nLook at this series: 88, 3, 80, 12, __, 21 ... What number is missing?\nOptions:\n(A) 72\n(B) 78\n(C) 68\n(D) 30\n(E) 70 Stream of consciousness:
User
A\n72\nThis is an alternating addition and subtraction series. In the first pattern, 8 is subtracted from each number to arrive at the next. In the second, 9 is added to each number to arrive at the next.
Thus, the answer is (A).
Assistant