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Railways PYQCBT 1 2016

RRB NTPC · Question 10

Based on the analogy given, find the missing pair from the given options. 5 : 35 ∷ ----------: -----------

  1. 11 : 55

  2. 7 : 77

  3. 3 : 24

  4. 9 : 45

Show answer & explanation

Answer: (B) 7 : 77

Explanation

35 = 5 × 7, the product of 5 and the next prime after it (7). In the same way, 7 is followed by the prime 11, and 7 × 11 = 77. So 7 : 77 has the same relationship.