1. The probability of the cans knocking over is
50percent because if you have a good aim you
could easily knock the cans over . If you didn't
have good aim you still could knock a few over
or none.
It would be easier if you stacked the cups like this
Eliza

2. This is harder because it's smaller and you need a lot of strength.
You could change the shape to make it harder or easier.
Eliza

3. The rules hit the cups with the ball provided . I succeed every
time I knocked at least 2 over.