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IKMC 2010 - Grades 5-6 Question 17

IKMC · IKMC 2010 - Grades 5-6

Question 17

In the picture, we see that $1+3+5+7=4\times4$. Then, $1+3+5+7+\cdots+17+19$ is equal to...?

Question illustration
  1. $10\times10$
  2. $11\times11$
  3. $12\times12$
  4. $13\times13$
  5. $14\times14$