Let's suppose you're in a lobby of 10 and there is 1 impostor, and you get impostor 4 times in a row. The chance of you getting impostor is 10%, for y amount of times you're impostor in a row, the chance will be 0.(y zeros - 3)% with the exception of 2 times and 3 times. In this case, the chances of getting impostor 4 times in a row would be 0.01%