Скачать или смотреть Number of ways of forming groups | Permutations and Combinations | Grade 11 | Math | Khan Academy

In this video, we solve two problems of forming groups with given constraints on selections. We realise that we need to consider all possible cases which are satisfied by the constraint and add the number of ways for each of them. For the first one, we form teams of boys and girls for three different scenarios - the team has no girls, has at least one boy and one girl, and has at least three girls. For the second one, the constraints are - exactly 3 girls, at least 3 girls, and at most 3 girls.

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Timestamps:
0:00 Problem 1 - Forming the team with boys and girls
0:40 Constraint - the team has no girls
1:40 Constraint - At least one boy and one girl
4:20 Constraint - At least three girls
4:47 Problem 2 - Forming the committe with boys and girls
8:30 Constraint - exactly 3 girls
8:35 Constraint - at least 3 girls
8:42 Constraint - at most 3 girls

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Created by
Ashish Gupta