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:	Choose one
A) 18
B) 19
C) 17
D) 16
E) 15
Explanation :   Let there were x teams participating in the games, then total number of matches:   =&gt;nC2.   =153   On solving, we get n=−17 and n=18.   It cannot be negative so n=18.   18nswer : 18
<result>A</result>
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: