## Enter Multifactorial

Calculate the multifactorial 7!!

We have 2 exclamation symbols (!)

Start at 7

Iterate backwards in steps of 2

Stop when we hit 1 or below

##### Term 1

For term 1, we start with 7

##### Term 2

Subtract -1 x 2 = -2 to get n(n - -2)

(n - -2) → 7 - -2 = 5

Our factorial term is:

7(5)

##### Term 3

Subtract -1 x 2 = -2 to get n(n - -2)(n - -2)

(n - -2) → 7 - -2 = 3

Our factorial term is:

7(5)(3)

##### Term 4

Subtract -1 x 2 = -2 to get n(n - -2)(n - -2)(n - -2)

(n - -2) → 7 - -2 = 1

Our factorial term is:

7(5)(3)(1)

##### Build final multifactorial answer:

7!! = n(n - -2)(n - -2)(n - -2)...

7!! = 7(5)(3)(1)

7!! = **105**

##### How does the Multifactorials Calculator work?

Free Multifactorials Calculator - Calculates the multifactorial n!^{(m)}

This calculator has 1 input.

### What 1 formula is used for the Multifactorials Calculator?

n!

^{(m)} = (n - m) * (n - m - m) * ... * 1

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### What 3 concepts are covered in the Multifactorials Calculator?

- factorial
- The product of an integer and all the integers below it
- multifactorial
- generalisation of a factorial in which each element to be multiplied differs from the next by an integer
- permutation
- a way in which a set or number of things can be ordered or arranged.

_{n}P_{r} = n!/(n - r)!

##### Example calculations for the Multifactorials Calculator

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