Question

In a tennis tournament, every pair has to play with every other pair. Total $10$ players are playing. Find the number of games played.

Answer 1

In every tennis match ,there are $4$ players Now selecting $4$ Players and dividing into two terms

No of games =${10}_{c_4}\times 3=210\times 3$$(LetpeopleareA,B,C,D)Soteamwillbelike(AB,CD)(AC,BD)(AD,BC)$

So No of games =$630$