In which of the following series is the value of Z incorrectly placed? Series I: 9, 14, Z, 27, 35, 44 Series II: 45, Z, 15, 60, 120, 240 Series III: 6, 12, Z, 30, 42, 56 Given value of Z is 20.

If Z equals 20, we test it in each series. In Series I, the pattern adds consecutive odd numbers (9+5=14, 14+7=21, 21+9=30), so 20 is correctly placed. In Series II, the pattern divides by decreasing integers or follows a multiplier, but 45 divided by 3 gives 15, making the second term 15 instead of 20. In Series III, the pattern adds consecutive even numbers (6+6=12, 12+8=20, 20+10=30), so 20 is correct. Therefore, the value of Z is incorrectly placed only in Series II.

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