It would help if you proofread your questions before you posted them. "Rach?"
More data needed.
More data needed.
In the game you described, in each round, every person chosen in the previous round chooses 3 more people. This can be visualized as a branching tree structure, where each level represents a round and each branch represents a person choosing 3 more people.
In the first round, three people are chosen.
In the second round, each of the three people chosen in the first round chooses 3 more people. So, we have 3 x 3 = 9 people chosen.
In the third round, each of the 9 people chosen in the second round chooses 3 more people. So, we have 9 x 3 = 27 people chosen.
In the fourth round, each of the 27 people chosen in the third round chooses 3 more people. So, we have 27 x 3 = 81 people chosen.
In the fifth round, each of the 81 people chosen in the fourth round chooses 3 more people. So, we have 81 x 3 = 243 people chosen.
In the sixth round, each of the 243 people chosen in the fifth round chooses 3 more people. So, we have 243 x 3 = 729 people chosen.
Therefore, in the sixth round, there will be 729 people chosen.