Câu hỏi:
4, 12, x, y, 105, z, 34. What are the values of x, y & z?
Đáp án:
x=36, y=108, z=102, To get x & y, multiply the preceding number by 3 to get the next value. But after y, the next numbers decrease by 3, So z=105-3=102, then at z, the numbers are divided by 3.
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