BF. Catching Errors
Credit card numbers have an error catching code, that uses the tricks of the last few weeks.
Archive for answers
BE. Trap door encryption
Is this podcast legally a “munition”? Old ideas in number theory are the basis for a whole new class of powerful encryption schemes that underlie the modern internet economy.
We just use the tools we discussed in the last couple of weeks, in a new way.
BA. The Ring is Exchanged
Peter Winkler answers his puzzle set in the Land of Kleptomaniacs, and we chat about Martin Gardner. We'll pose another puzzle next week!
AY. Dollar Cost Averaging
A common investment strategy takes advantage of the subtleties of averaging.
AV. Dennis Shasha Answers
Dennis Shasha, author of The Puzzler’s Elusion explains how his finger multiplication works!
AT. Peter Winkler Answers
Peter Winkler answers. Another puzzle next week!
AS. A Puzzle From Peter Winkler
Peter Winkler, author of “Mathematical Puzzles: A Connoisseur's Collection”, asks how many coins are needed to cover a table.
AQ. The Principle of Indifference Redux
The solution to the balls puzzle and a quick puzzle about cards.
AO. Choosing Balls from A Bag
A fifty-fifty chance of drawing four blue balls from a bag: how many balls were blue?
AM. Arrow's Theorem
Can A be better than B, B be better than C and C be better than A? No voting system will ever be fair!
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