xPx-1 = 6
P = Permutation
With Solution Please
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Before we solve
The question is asking us, "can you use the definition of permutation?" We have to change into the form that we can solve.
Keys
- Permutation
A permutation is the number of ways to line up r people, from n people.
Solution
Here, .
First things first,
So, we have,
Then,
More information
- Combination
A combination is the number of ways to choose r quantities, from n quantities.
To derive the combination, we simply remove the same possibilities that happen from changed orders.
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