Paper 1 · Mathematical Reasoning and Aptitude
Which of the following will not be a number of the series 1, 8, 27, 64, 125, ?
A256 ✓ Correct
B512
C729
D1000
Correct answer: (A) 256 — 256 will not be a number of the series, so that is the answer.
Explanation
★256 will not be a number of the series, so that is the answer.
★The series is made of perfect cubes.
★1, 8, 27, 64 and 125 are the cubes of 1, 2, 3, 4 and 5.
★512, 729 and 1000 are the cubes of 8, 9 and 10.
★256 is not a perfect cube of any whole number.
★So 256 cannot belong to this series of cubes.
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