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AMO 2027 Grades 8-9 SET 10 - Self-study Question 5

AMO · AMO 2027 Grades 8-9 SET 10 - Self-study

Question 5

Find the sum of the following series:
$$1+3+5+7+\ldots+197+199.$$
  1. $10000$
  2. $90000$
  3. $19900$
  4. $19450$
  5. None of the above