1. Ask the Swap Question: If I swap two items, is the result different?
- Yes = Permutation ($nPr$). (Order Matters).
- No = Combination ($nCr$). (Order Doesn't Matter).
2. Factorial Check: $n!$ means $n \times (n-1) \times (n-2)...$ down to 1.
3. $0! = 1$: By definition, there is exactly one way to arrange "nothing."
Calculate these total arrangements.
$4! = $
$6! / 4! = $
The Alphabet: How many ways can you arrange the letters in the word "FAITH"?
Mark each scenario as either a Permutation (P) or a Combination (C).
Choosing a President, Vice President, and Secretary from a group of 10 people.
Choosing a "cleaning crew" of 3 people from a group of 10.
Creating a 4-digit PIN for your bank account.
Choosing 5 books from the library to take home for the week.
In the "cleaning crew" problem, if you chose {Peter, James, John}, would that be a different crew than {John, James, Peter}? Explain.
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Use the formulas: $nPr = \frac{n!}{(n-r)!}$ and $nCr = \frac{n!}{r!(n-r)!}$.
The Race: 8 runners are in a race. How many different ways can the Gold, Silver, and Bronze medals be awarded?
The Missionary Team: A church has 10 members willing to go on a trip. They only have room for 4. How many different teams of 4 can be made?
Moses needs to choose 3 tribes out of the 12 to lead the march.
1. If the order of the 3 tribes in the line matters, how many arrangements are there?
2. If he just needs a committee of 3 tribes to meet with him, how many combinations are there?
Objective: Explain the difference between order and group to a younger sibling.
The Activity: Use 3 toys (A, B, C).
1. Ask them to line them up for a "parade." How many ways? (6).
2. Ask them to just put 2 toys in a bag. How many ways? (3: AB, AC, BC).
The Lesson: "Parades have ranks (1st, 2nd, 3rd). Bags have friends (they are just together). In God's family, we are 'friends' in the bag first!"
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