2.4.2/( 1- 1/3)* 1/3 = 1.2m

3.1500/(1+1/5) *1/5 = 250 sets.

4.600/(5/9)*( 1-5/9)=480 people.

5.600/( 1-5/9)*5/9=720 people.

6.600/(1-1/5-1/5) * (1-1/5 * 3) = 400 people.

7.600/(1-1/5 * 3) * (1-1/5 * 2) = 900 people.