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
The product rule with tables and trees, counting digit by digit, permutations and factorials, and words with repeated letters. Challenges with solutions at the end.
28 slides · 4 animations
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
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
Chance lab
When outcomes cannot be counted, they are measured. The alarm clock, the cut ribbon, the square of pairs (the meeting, the cinema), the stick broken in three, points on a circle, Sylvester’s problem and Buffon’s needle.
35 slides · 10 animations
For teachers only
Chance lab
Predict before calculating. The two trains and the waiting time, Simpson, Bernstein’s independence, Secret Santa, Bertrand, St Petersburg, the two envelopes, the hospital, Linda, Efron’s dice and the surprise exam.
31 slides · 6 animations
For teachers only
Chance lab
Conditioning means counting again among the cases that remain. Tables and trees, the taxi and the virus test (the base rate), Bertrand’s boxes, Monty Hall, the three prisoners, the boy born on a Tuesday and the hats.
31 slides · 4 animations
For teachers only
Chance lab
The drunkard’s walk on the line. Where it is after n steps, the return to the origin (Pólya), gambler’s ruin, waiting for coin patterns, the ant on the cube, misleading investments and the arcsine law.
29 slides · 6 animations