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Railways PYQCBT 1 2016

RRB NTPC · Question 93

Based on the given symmetry, find the matching pair from the given alternatives. 27 : 9 A. 125 : 5 B. 135 : 15 C. 64 : 8 D. 729 : 81

  1. A

  2. D

  3. B

  4. C

Show answer & explanation

Answer: (B) D

Explanation

27 = 3³ and 9 = 3², so the first number is the cube and the second the square of the same base. 729 = 9³ and 81 = 9², so 729 : 81 matches.