$\"\"$

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The permutation is $\"\"$

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The permutation formula is $\"\"$ .

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$\"\"$ (Apply permutation formula)

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$\"\"$ (Subtract denominator: $\"\"$ )

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$\"\"$ (Expand factorials)

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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The value of $\"\"$ is 120.