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Finite Math Examples

${}_{4}C_{3}$

Step 1

Evaluate

${}_{4}C_{3}$ using the formula

${}_{n}C_{r} = \frac{n!}{(n - r)! r!}$ .

$\frac{4!}{(4 - 3)! 3!}$

Step 2

Subtract

$3$ from

$4$ .

$\frac{4!}{(1)! 3!}$

Step 3

Simplify

$\frac{4!}{(1)! 3!}$ .

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Step 3.1

Rewrite

$4!$ as

$4 \cdot 3!$ .

$\frac{4 \cdot 3!}{(1)! 3!}$

Step 3.2

Cancel the common factor of

$3!$ .

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Step 3.2.1

Cancel the common factor.

$\frac{4 \cdot 3!}{(1)! 3!}$

Step 3.2.2

Rewrite the expression.

$\frac{4}{(1)!}$

$\frac{4}{(1)!}$

Step 3.3

Expand

$(1)!$ to

$1$ .

$\frac{4}{1}$

Step 3.4

Divide

$4$ by

$1$ .

$4$

$4$

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$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$