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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:

Answer & Solution
Correct Answer: Option A
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
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