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Telangana Police Constable 2018 · Question 76 of 125

The number of primes between 10 and 50 that remain primes when their digits are reversed is

Number System

  1. A4
  2. B5Correct
  3. C6
  4. D3

Answer: B. 5

Explanation

11, 13, 17, 31 and 37 remain prime when reversed - 5 numbers.

Source: Telangana Police Constable Preliminary Exam 2018 Official Paper (TSLPRB) via Examrace/Doorsteptutor

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