CA Foundation · Quantitative Aptitude · Number Series, Coding-Decoding and Odd Man Out
In the series 2, 3, 5, 9, 17, 33, 66, one term does not fit the pattern. Which term is wrong and what is its correct value?
The differences between consecutive terms double each time: 1, 2, 4, 8, 16, and then 32. So the term after 33 should be 33 plus 32, which is 65. Therefore 66 is wrong and should be 65.
- A66 should be 65Correct
- B33 should be 32
- C17 should be 15
- D9 should be 8
Explanation
Differences are 1, 2, 4, 8, 16, so the next difference should be 32. Hence the last term should be 33 + 32 = 65, not 66. Changing 33 to 32 would break the earlier difference of 16 from 17.
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