Slides ready to project: each problem is posed on one slide and solved on the next, with animations and teacher notes. They open in the browser, with nothing to download or install.
In the slides: arrow keys or click to move on, F full screen, N teacher notes.
For teachers only
The slides open with a teacher account. Signing up is free and also gives you groups, competitions and tracking of your students in the labs.
For teachers only
Combinatorics Almanac
Ana’s routes (a Gardner problem), the sum rule, Pascal’s triangle, bijections and binomial coefficients, with their formula and two proofs of Pascal’s rule.
27 slides · 3 animations
For teachers only
Combinatorics Almanac
Classic bets to vote on before calculating: the Chevalier de Méré, Galileo’s three-dice problem, the birthday problem, the lottery against 24 heads, Newton and Pepys, and Pascal and Fermat’s problem of points.
27 slides · 4 animations
For teachers only
Combinatorics Almanac
Fifteen problems for the advanced reader: Marta’s staircase, teams without colours, Magda’s dolls, the hockey stick, dominoes, balls and dividers, Anita’s necklace, the urn with nine balls and the absent-minded secretary. Each problem is posed on one slide and solved on the next.
36 slides · 5 animations