In a hockey championship, there are 153 matches played. Every two team played one match with each other. The number of teams participating in the championship is:

A.

18

B.

19

C.

17

D.

16

• Let there were x teams participating in the games, then total number of matches:
  =nC2=153
  
  On solving we get n=−17 and n=18.
  It cannot be negative so n= 18 is the answer.
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