Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 6, 11, 21, 41, 81, ?
Option 1: 241
Option 2: 151
Option 3: 161
Option 4: 240
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Correct Answer: 161
Solution : Given: 6, 11, 21, 41, 81, ?
The pattern is as follows – (6 × 2) – 1 = 12 – 1 = 11 (11 × 2) – 1 = 22 – 1 = 21 (21 × 2) – 1 = 42 – 1 = 41 (41 × 2) – 1 = 82 – 1 = 81 (81 × 2) – 1 = 162 – 1 = 161
So, the missing number is 161. Hence, the third option is correct.
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