1. A class has 15 girls and 10 boys. The teacher wants to form an unordered...

1. A class has 15 girls and 10 boys. The teacher wants to form an unordered pair consisting
of 1 girl and 1 boy. How many ways are there to form such a pair?

2. For the same setup (i.e. class of 15 girls and 10 boys), the teacher wants to form an
unordered group of 3, consisting of 2 girls and 1 boy. How many ways are there to form
such a group?

3. For the same setup (i.e. class of 15 girls and 10 boys), assume the teacher now wants to
form an ordered group of 3, consisting of 2 girls and 1 boy (e.g., think of each student
having a different task, so their order, i.e. who does what, matters). How many ways
are there to form such a group?

Solutions

Expert Solution

Solved by classical probability approach

milcah answered 8 months ago

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