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How many digits are used in all to number the pages of a book that has 250 pages?

Competition practiceNumber System, HCF & LCM
  • A642
  • B750
  • C652
  • D639

Step-by-Step Solution

Pages 1–9 use 9 digits, pages 10–99 use , and pages 100–250 use . Total 9 + 180 + 453 = 642.
Answer: A) 642

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