Question

What does the symbol for factorial function (n!) mean?
a.
It means to divide a series of descending natural numbers.
c.
It means to divide a series of ascending natural numbers.
b.
It means to multiply a series of descending natural numbers.
d.
It means to multiply a series of ascending natural numbers.

Answer 1

It means B and it can also mean D.

Take for example $3!$ which can be written as $3!=3\cdot2\cdot1$ in descending order however $3\cdot2\cdot1=1\cdot2\cdot3=3!$.

Further reading.

The factorial function $n!$ where $n\in\mathbb{Z}^+$ is defined as taking the n-th derivative of exponential function $x^n$ namely,

$\dfrac{d^n}{dx^n}x^n=n!$.

We observe that we approach smaller and smaller values of n and therefore multiply by smaller and smaller natural number while total product increasing since every number we multiply the product with is non-decimal.

Hope this helps.

Answer 2

Answer:

B. It means to divide a series of ascending natural numbers.

Step-by-step explanation:

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