KöMaL 2011 B4399
A sack contains red balls and green balls. The balls are drawn out one by one, without replacement, until the first red ball is drawn. How many draws are needed on average?
Official text KöMaL. Quoted with source.
Solutions
No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.
Similar problems
These problems have the most words in common with this statement.