Question 54
EasyOriginal questionFind the wrong term in the series 5, 11, 17, 23, 30, 35.
Show the answer and explanation
CorrectNot quiteAnswer D
Correct answer: D
Explanation
Differences: 6, 6, 6, 7, 5. The pattern is +6, broken at the fifth term.
, and fits the last term, so 30 is wrong (it should be 29).
Worth noting
A wrong term spoils TWO differences (here 7 and 5). The term shared by both odd differences is the culprit.
- Concept
- Wrong term in a constant-difference series
- Typical timeTypical
- 40 s
- Your timeYours
- —
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