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IKMC 2010 - Grades 5-6 - Self-study Question 14

IKMC · IKMC 2010 - Grades 5-6 - Self-study

Question 14

The picture illustrates $1+3+5+7=4\times4$. What is $1+3+5+7+\cdots+17+19+21$?

Question illustration
  1. $10\times10$
  2. $11\times11$
  3. $12\times12$
  4. $13\times13$