Category Archives: CDS Elementary Mathematics

CDS(I) 2009 Elementary Mathematics Q-1

When a natural number n is divided by 4, the remainder is 3. What is the remainder when 2n is divided by 4?

  1. 1
  2. 2
  3. 3
  4. 6

Answer:- 2
Assume that x is the quotient.
So, n = 4x + 3
so, 2n = 8x + 6 = 8x + 4 + 2
Therefore, if 2n is divided by 4, remainder is 2.

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