A league of 18 teams is playing a "round-robin" style tournament, where each team plays every other team exactly once. How many games total need to be played? SEE SCREENSHOT :)

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anonymous · Answer

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anonymous · Answer

This is a simple arithmetic progression sum.
Lets take an example.

If there are 3 teams playing then a total of 3 matches are played.

where each team has hence played 2 matches with each other once.

If there are 4, each would play 3 matches.

The number of matches is found by - no. of teams x no of matches by each/2

which is 4x3/2 = 6
if number of teams = 18, then matches played per every team = 17.

Hence here the case will be 18x17/2 = 153.

anonymous · Answer

great answer and even better explanation!

anonymous · Answer

do you have any feedback on the graph?

anonymous · Answer

Actually nope. :P

anonymous · Answer

:(((