Question

There are 6 teams in a match. Each team had to play a match with every one of
the rest. How many matches will be played in the Tournament?
a. 6
b. 12
c. 15
d. 18​

Answer 1

total number of matches =5+4+3+2+1=15

cause first team will play against rest of the 5 teams

the 2nd team will play rest of the 4 teams (coz already team 2 played with 1st team so..here 4)

and 3rd team will play 3

so..on..