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Railways PYQCBT 1 2016

RRB NTPC · Question 80

When a natural number n is divided by 5 the remainder is 4. What is the remainder when 2n is divided by 5? A. 2 B. 3 C. 4 D. 0

  1. A

  2. D

  3. B

  4. C

Show answer & explanation

Answer: (C) B

Explanation

n = 5k + 4, so 2n = 10k + 8 = 5(2k + 1) + 3. The remainder is 3.