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VTMO 2014 — Grade 4 — semifinal Question 6

VTMO · VTMO 2014 — Grade 4 — semifinal

Question 6

How many digits are needed to number a $36$-page book starting at $1$?
  1. $36$
  2. $72$
  3. $43$
  4. $63$
  5. $11$