Question : Find out the wrong number in the series: 190, 166, 145, 128, 112, 100, 91
Option 1: 100
Option 2: 166
Option 3: 145
Option 4: 128
Correct Answer: 128
Solution : Given: Sequence is 190, 166, 145, 128, 112, 100, 91. Calculating the first difference, 190 – 166, 166 – 145, 145 – 128, 128 – 112, 112 – 100, 100 – 91 = 24, 21, 17, 16, 12, 9 All the first differences are divisible by 3 except 17 and 16. $\therefore$ 128 is the common number that is causing this difference. Hence, the correct answer is 128.
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