Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
159, 146, ?, 120, 107, 94, 81
Option 1: 136
Option 2: 131
Option 3: 133
Option 4: 140
Correct Answer: 133
Solution :
Given:
159, 146, ?, 120, 107, 94, 81
Subtract 13 from each number to obtain the next number.
159 – 13 = 146; 146 – 13 = 133; 133 – 13 = 120; 120 – 13 = 107; 107 – 13 = 94; 94 – 13 = 81
So, the missing number of the series is 133. Hence, the third option is correct.
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