Khan Academy Static

Discover how combinations were used to design crowds of robots in "WALL-E." This lesson introduces the counting principle using tree diagrams and takes 30-45 minutes to complete.

17997_3_Tree_challenge.html

18000_Getting_to_know_Fran_Kalal.html

17995_1_Counting_with_tables.html

17998_4_Counting_with_trees.html

17999_5_Casting_challenge.html

17994_Introduction_to_combinatorics.html

17996_2_Robot_combinations.html