Question

What does ! mean in a math problem?

Answer 1

Answer:
! is the symbol for factorial.

Reason:
n! is the product (multiplication) of all the numbers from n down to 1, inclusive, i.e. n × (n−1) × (n−2) × … × 2 × 1.

For example:

5! = 5 × 4 × 3 × 2 × 1 = 120

10! = 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 3,628,800

OR:
The there was a typo or a mistake that was made in the making of these questions.


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Answer 2

! is shorthand for the factorial function. If $n$ is a non-negative integer, then

$n! = n\times(n-1)\times(n-2)\times\cdots3\times2\times1$

with $0! = 1$.

So how to compute $n!$ ?

Multiply each number in sequence from that number to 1.