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Hokage OBMEP training, course for those who want to get gold at OBMEP: https://www.soomi.com.br/#!/treinamen... INSTAGRAM: / soomi_oficial OBMEP 2021 - LEVEL 3 - PHASE 2 - QUESTION 3 The numbers of 1 to 9 are distributed randomly and without repetition in the squares drawn on the board next to them. a) What is the probability that the central square will be filled with an odd number? b) What is the probability that the grid has a column filled with only even numbers? c) What is the probability that the grid has a row and a column filled with only odd numbers? Who is part of Só o Mi? --Leonardo Silva Nóbrega --Lucas Silva Nóbrega --Thais Silva Nóbrega We are all OBMEP medalists (mathematics Olympiad) and have participated in 7 editions of the OBMEP Scientific Initiation Program