Find the one which does not belong to that group ?

Correct answer: B. 121

A. 343
B. 121
C. 1331
D. 2197Downloading Digital Educational Resources

Explanation

343 = 7 x 7 x 7, 1331 = 11 x 11 x 11, and 2197 = 13 x 13 x 13, so these are perfect cubes. 121 = 11 x 11 is a perfect square rather than a cube, making it the odd one. A student may choose 343 because it is the smallest number, but size is not the relevant property.

Written and checked by Zahid Hussain, MS Computer ScienceLast updated 2 September 2026

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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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