Find the one which does not belong to that group ?
Correct answer: B. QOR
- A. GFI
- B. QOR
- C. LKN
- D. YXA
- E. TSV
Explanation
The first letter is followed by the previous letter and then the letter three positions after the first: GFI gives 7, 6, 9, and LKN gives 12, 11, 14. QOR gives 17, 15, 18, so its first change is -2 instead of -1. The likely trap is YXA, but alphabet wraparound makes it 25, 24, 1, which follows the same rule.
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Sequences describe ordered terms formed by a pattern, while series represent the sum of those terms. Questions cover arithmetic and geometric sequences, their nth terms, common difference or ratio, finite sums, and applications, with the sequence itself kept distinct from the corresponding series.
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