I can't even solve the very first one (meaning the easiest one).
I sympathize.
Added 5 minutes later
In general, I advise you to install Mathcad.
Added 9 minutes later
By the way, problems for discrete cases, like coin toss games, are trivially solved. It's when you need to deal with limits and the binomial distribution that you need to use your brain a little more.
И пока в кармане пачка милкиуэйев - значит все не так уж плохо на сегодняшний день