SSC JE Mechanical Engineering 25-Sep-2019 Shift 1 Paper

There are 11 players in the tournament and each player has to play with every other once.
1‌st player will play 10 games → 10
2‌nd player will have 9 games as his game with player 1 is already counted → 9
3‌rd player will have 8 unique games as 2 of his games are already counted → 8
Similarly,
4‌th → 7
5‌th → 6
7‌th → 5
8‌th → 4
9‌th → 3
10‌th → 2
11‌th → 1
Total number of games = 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 55
Hence, “55” is the correct answer.