ITMC 2018 Grade 2 National Preliminary set01 Question 23

At the 2018 FIFA World Cup, 32 teams are divided into 8 groups A–H of 4 teams each. In the first round, every pair of teams in a group plays exactly once. A win earns 3 points and a loss 0 points; a draw earns each team 1 point. The two teams with the highest points in each group advance to the second round.

How many first-round matches are played in each group?