Find the one which does not belong to that group ?
Correct answer: D. I91
- A. B4
- B. E25
- C. D16
- D. I91
- E. F36
Explanation
The number after each letter should be the square of its alphabet position: B is 2 and 2² = 4, E is 5 and 5² = 25, and F is 6 and 6² = 36. I is the ninth letter, so it should be paired with 9² = 81, not 91. Students may select D16 by missing that D is the fourth letter and 4² = 16.
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About Sequences and Series
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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