Number Series · Question 10 · Medium
Find the wrong number in the series: 3, 5, 9, 17, 33, 66, 129
- 17
- 66
- 33
- 129
Answer and explanation
Answer: B. 66
Explanation: Each term should be (previous × 2) − 1: 3, 5, 9, 17, 33, 65, 129. So 66 is wrong; it should be 65.
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