Expand 4! 4 [ 4+5+6 ] [ 4321 ] [ 4+3+2+1 ]

## Step1: Definition of Factorial<br />### The factorial of a non-negative integer $n$, denoted by $n!$, is the product of all positive integers less than or equal to $n$.<br /><br />## Step2: Expanding 4!<br />### $4! = 4 \times 3 \times 2 \times 1$<br /><br />## Step3: Calculating the Product<br />### $4 \times 3 \times 2 \times 1 = 24$