In this type of tournament, the team which is defeated once’ gets eliminated immediately and will not be given another chance to play. The total number of matches to be played in this tournament will be equal to the number of teams participating minus one (AT—1),
if 21 teams are participating, the total number of matches will be 21-1=20. Number of teams in upper half.
Number of teams in lower half
Total number of byes
= Next power of two – total teams
= 32 – 21 = 11 byes
HERE IT IS GIVEN FOR 21 TEAMS YOU CAN DO IT FOR 4 TEAMS