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This video details how to create a two-way table in Excel that can calculate joint probabilities.
This video clearly explains all distributions associated with two-way tables including joint, marginal, and conditional distributions.
Extensive discussion of the classic St. Petersburg paradox with numerous alternatives given to the classic formulation.
An applet which simulates a game of chance between the gambler of finite means and the bank, which cannot go bankrupt. Vary the starting amounts and the target amount to win.

The Gambler's Ruin problem explained as a conditional probability.

Concise statement of problem with clearly written proof of solution. Several nice examples with solutions are given. Applications to risk insurance and simple random walks included.
Simple, straightforward definition of the problem with a solution. No explanation of how the solution is found.
This applet allows the user to enter values for $n$ and $p$.
The page generates numeric and graphic displays for different value of $n$ and $p$ which are entered by the user.
This site provides a lesson that the user can work through. There are pages for derivation, graphs, examples and links to other sites.