Can you explain what permutations are?
Sure! Permutations refer to the different ways in which a set of items can be arranged. For example, the permutations of the letters A, B, and C are ABC, ACB, BAC, BCA, CAB, and CBA.
How do you calculate the number of permutations for a set?
To calculate the number of permutations of a set of n items, you use the formula n! (n factorial), which is the product of all positive integers up to n.
Can you give me an example of calculating permutations?
Of course! If you have 3 items, say A, B, and C, the number of permutations is 3! = 3 × 2 × 1 = 6.
What about permutations with repetition?
When items can be repeated, the formula changes to n^r, where n is the number of items and r is the number of positions.
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