7. In a tournament here are n teams T1, T2……Tn with n>5. Each team consists of k players, k>3. The following pairs of team have one player in common T1 and T2 and T3….., Tn-1 and Tn and Tn2nd T1- No other pair of teams has any player in common. How many players are participating in the tournament, considering all the n team together?
10.Along a road lie an odd number of stones placed at intervals of 10 m. These stones have to be assembled around the middle stone. A person can carry only one stone at a time. A man carried out the job starting with the store in the middle, carrying stones in succession, there by covering a distance of 4.8 km. Then, the number of stone is: