In a certain match all the teams were to play with each other. If there are 7 teams, how many matches will have to be played? Choose the correct choice from the following answers
A) 40	B) 21	C) 24	D) 25	E) None of the above
7c2   =21   ANSWER:21
<result>B</result>
In a certain match all the teams were to play with each other. If there are 7 teams, how many matches will have to be played?