duda
Welcome to LP and the Mathematics section.
Now FastEddy is pretty quick on the uptake but for the passing browser I think we should clarify a few things with your minimalist method. I have to confess I think this is a variation on the method first promulgated on this forum by WinSumLoseSum - hopefully he didn't patent it, otherwise you could be facing a huge sum to pay out in punitive damages.
Firstly, we must point out to people that the 10 on the penny is not a 10 and in a reverse application of the root theory we take one from nothing which gives us 0. So now we have numbers 0 to 9.
Secondly, we must write down each number after extracting it because we are talking of drawings with replacement. On reflection I think your method of writing the numbers on the pennies is fairer because a sensitive person picking a penny from a bucket could tell which side the head was on.
Thirdly, they need to really shake those pennies between each draw - maybe, a KFC bucket would be OK after eating the chicken of course. And to help things along I would suggest a bit of doo da music (you're probably familiar with that) or even rap.
Maybe -
Flying Like a Bird
Buzzin Like a Bee
You don't want
To be a messin with me
Flying Lke a Bird
Buzzin Like a Bee
I just is the prettiest thing
you've seen.
Colin
PS If you don't like this Post then I think my 8 year old daughter will - I'll show her tomorrow. She thinks my best Post was the Chicken hatching one. I know she is going to be the first woman Prime Minister of Australia.