In a certain match all the teams were to play with each other. If there are 10 teams, how many matches will have to be played?	Choose the correct choice.
A) 40
B) 45
C) 60
D) 90
E) None of the above
10c2   =45   ANSWER:45
<result>B</result>
In a certain match all the teams were to play with each other. If there are 10 teams, how many matches will have to be played?