I suspect they were looking for you to do some risk/reward analysis. Personally, I would play one time, bet an amount of money I wouldn't be unhappy to lose an

I suspect they were looking for you to do some risk/reward analysis. Personally, I would play one time, bet an amount of money I wouldn't be unhappy to lose and continue flipping until I were into 5 digits. On a $10 bet, that would be 10 flips, and I'd have a 1/1024 chance of pulling it off.