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K. 481. What is the sum of the numbers in the $\displaystyle 20\times 20$ multiplication table? (The figure shows the $\displaystyle 5\times 5$ multiplication table.)

(6 points)

This problem is for grade 9 students only.

Deadline expired on 11 January 2016.

Statistics on problem K. 481.
 146 students sent a solution. 6 points: 120 students. 5 points: 14 students. 4 points: 1 student. 3 points: 1 student. 2 points: 3 students. 1 point: 2 students. 0 point: 5 students.

• Problems in Mathematics of KöMaL, December 2015

•  Támogatóink: Morgan Stanley