Find the one which does not belong to that group ?

Correct answer: A. 30

A. 30
B. 27
C. 36
D. 45

Explanation

27, 36, and 45 are all multiples of 9: 27 = 9 x 3, 36 = 9 x 4, and 45 = 9 x 5. Although 30 is also a multiple of 3, it is not a multiple of 9, so it is the odd one. A student may choose 36 by focusing on its being a perfect square, without checking the common divisibility rule.

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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