In this post we will resolve the OBMEP 2019 questions with comments. Question 1 Marcelo throws five rings onto a wooden peg, one at a time. When the ring hits the pin, he earns points, as shown in the table below. When the ring doesn’t hit the pin, he doesn’t get any points. The figure shows five throws made by Marcelo, in which only the blue and green rings hit the pin. Note that the green ring was the last one thrown, as it was on top of the others