On-thread Trivia!

aaaand the question for today is:
Q. You are to divide 9 balls - 4 green and 5 red into 2 boxes. You pick a box at random and a ball from it at random. If it is red, you DIEEEE!, if it is green (I will let) you live. How would you maximize your odds of living?
Finally I can figure it out

If I can put the ball by myself, I will put 5 red + 3 green in the first box and left the 1 green ball in the second box. So whenever I pick the box, I know that the box with just 1 ball on it is have the green ball.
And if I'm not allowed to put the ball by myself, I will just pick the box with less balls. Because the box with more balls is has to be the red ball in it
