Multiple choice

The first twenty natural numbers from $1\ to \ 20$ are written next to each other to form a $31-$digit number $N = 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20$. What is the remainder when this number is divided by $16$

  1. $0$
  2. $4$
  3. $7$
  4. $9$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A number is divisible by 16 if its last four digits are divisible by 16. The number ends in ...1920. 1920 / 16 = 120. Since 1920 is divisible by 16, the remainder is 0.