Question

A Tennis tournament is to be played by $10$ pairs of students and each pair is to play with every other pair one set. If four sets are played each day then the number of days required for the tournament is

• A. $12$
• B. $16$
• C. $80$
• D. $90$

Answer 1

The correct option is A $12$

Required days $=\frac{\text{Number of games}}{4\text{sets}}=\frac{{}^{10}{C}_2}{4}=12\text{days}$