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Railways PYQCBT 1 2020

RRB NTPC · Question 12

Find the number of all prime numbers less than 55.

  1. 15

  2. 17

  3. 18

  4. 16

Show answer & explanation

Answer: (D) 16

Explanation

Primes below 55: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53 – that is 16.