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MathNet 2021 — Part 01 Question 49

Math Olympiad Vault · MathNet 2021 — Part 01

Question 49

The pages of a notebook are numbered consecutively such that the first sheet contains the numbers $1$ and $2$, the second sheet contains the numbers $3$ and $4$, and so on. One sheet is torn out of the notebook. The page numbers on the remaining sheets are added. The resulting sum equals $2021$.

a. How many pages can the notebook have had originally?

b. Which page numbers could be found on the sheet that has been torn out?