Your move brainlet

Your move brainlet.

...

I would switch doors

the goat is in the second box with a probabillity of -1/3+1

You have to reset the sample space calculations.

Therefore 50%

9 - 3/.3333333 + 1 = ?
9 - 9 + 1 = ?
0 + 1 = ?
1 = ?
Learned this in my analysis course

9 - (3x3) + 1
9 - (9+1)
9-10
-1

9-3x3+1
9-9+1
0+1
1

0.999...

9 + (-3) * 3 + 1
9 + -9 + 1
9 + -8 OR 0 + 1
1