Find the one which does not belong to that group ?
Correct answer: C. 58
- A. 20
- B. 42
- C. 58
- D. 72
Explanation
Three numbers are products of consecutive even numbers: 20 = 4 x 5, 42 = 6 x 7, and 72 = 8 x 9. The expected middle pattern would give 7 x 8 = 56, not 58, so 58 is the odd one. A student may choose 42 by treating the numbers as unrelated even numbers instead of checking the product pattern.
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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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