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UPSC PYQPrelims 2025

Civil Services Examination · Question 80

The difference between any two natural numbers is 10. What can be said about the natural numbers which are divisible by 5 and lie between these two numbers?

  1. There is only one such number.
  2. There are only two such numbers.
  3. There can be more than one such number.
  4. No such number exists.
Show answer & explanation

Answer: (C) There can be more than one such number.

Explanation

Between 5 and 15 lies only 10, but between 6 and 16 lie 10 and 15. So there can be more than one. (Answer as per the official UPSC answer key.)