MathProbabilityEvents and probabilities

Calculating cardinality

Permutation formulation

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Permutation, perumtation, premutation... So many ways! How to count all of them? Choose the correct formula for permutations of lenght $n$ .

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n!=1 \cdot 2 \cdot 3 \cdot ... \cdot n

n!=1 \cdot 2 \cdot 3 \cdot n

n!=1 \cdot 2 \cdot 3 \cdot ... \cdot (n-1)

n!=1+2+3+...+n

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