Find the one which does not belong to that group ?
Correct answer: C. 4242
- A. 4422
- B. 2442
- C. 4242
- D. 2244
Explanation
4422, 2442, and 2244 each contain a pair of identical adjacent digits, namely 44 or 22. In 4242, the digits strictly alternate, so it has no identical adjacent pair. A student may choose 2442 because it is a palindrome, but 2442 is not the only option with a special digit arrangement.
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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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