9! = ?
9x8x7x6x5x4xx2x1 = .
! is just a "factorial" sign, it means to start at that number and multiply each number in a descending order until you get down to x1
by definition,
n! = 1x2x3x...xn
e.g
4! = 1x2x3x4 = 24
To find the value of 9!, which represents 9 factorial, first let's understand what factorial means. Factorial is the product of all positive integers less than or equal to a given number. For example, 5! (read as "5 factorial") is equal to 5 × 4 × 3 × 2 × 1.
To calculate 9!, we multiply all the whole numbers from 1 to 9 together:
9! = 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1
Now, let's calculate it step by step:
9! = 9 × 8!
8! = 8 × 7!
7! = 7 × 6!
6! = 6 × 5!
5! = 5 × 4!
4! = 4 × 3!
3! = 3 × 2!
2! = 2 × 1!
Using this chain of calculations, we can find the value of each factorial starting from the largest one, which is 9!. By substituting each value, we finally calculate:
9! = 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1
Simplifying this multiplication will give us the answer.
Therefore, 9! equals 362,880.