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AMO 2025 Secondary 1 (Grade 7) Question 8

AMO · AMO 2025 Secondary 1 (Grade 7)

Question 8

What value does $S=1/3+1/9+1/27+1/81+1/243+\cdots$ approach as more terms are included?

Question illustration
  1. $1/2$
  2. $1/4$
  3. $4/5$
  4. $8/9$