$\"\"$

The number of premutations of 4 objects taken 3 at a time is $\"\"$

The permutation formula is $\"\"$ .

$\"\"$ (Apply permutation formula)

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

$\"\"$ (Expand factorials)

$\"\"$ (Cancel common terms)

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

The number of permutations are $\"\"$ .