Find the one which does not belong to that group ?

Correct answer: D. 426

A. 525
B. 39
C. 24
D. 426
E. 636

Explanation

Each valid number places a digit beside its square: 5² = 25 gives 525, 3² = 9 gives 39, 2² = 4 gives 24, and 6² = 36 gives 636. For 4, the square is 16, so the matching form should be 416, not 426. A student may choose 39 because it has only two digits, but it still represents 3 followed by 3².

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

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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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