How to divide x number of players into 2 teams randomly multiple times, differently every time?

Question

I have a mathematical problem in my JavaScript code. I need to divide a given number of players into 2 teams randomly so that each time – if players want to play again – the

Answer 1

For the even cases, just pick numbers you haven't used randomly and make teams.

For the odd cases, pick a number randomly to sit out. Then the remaining numbers are like an even case.