The expression 6 x 5 x 4 x 3 x 2 x 1 represents the factorial of 6, denoted as 6!. In simple terms, a factorial is the product of all positive integers up to a given number.
To calculate this, you multiply 6 by each of the integers less than it down to 1:
- 6 x 5 = 30
- 30 x 4 = 120
- 120 x 3 = 360
- 360 x 2 = 720
- 720 x 1 = 720
So, 6! equals 720. Factorials are commonly used in areas such as mathematics, statistics, and combinatorics, especially when dealing with permutations and combinations.