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ITMC 2018 Grade 3 National Preliminary set01 Question 13

ITMC · ITMC 2018 Grade 3 National Preliminary set01

Question 13

Let $N=9+99+999+9999+99999$. How many digits of N are 9?
  1. 0
  2. 1
  3. 2
  4. 3
  5. 4