Finite Math Examples

${}_{3}C_{1}$

Step 1

Evaluate

${}_{3}C_{1}$ using the formula

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

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

Step 2

Subtract

$1$ from

$3$ .

$\frac{3!}{(2)! 1!}$

Step 3

Simplify

$\frac{3!}{(2)! 1!}$ .

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Step 3.1

Rewrite

$3!$ as

$3 \cdot 2!$ .

$\frac{3 \cdot 2!}{(2)! 1!}$

Step 3.2

Cancel the common factor of

$2!$ .

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Step 3.2.1

Cancel the common factor.

$\frac{3 \cdot 2!}{(2)! 1!}$

Step 3.2.2

Rewrite the expression.

$\frac{3}{1!}$

$\frac{3}{1!}$

Step 3.3

Expand

$1!$ to

$1$ .

$\frac{3}{1}$

Step 3.4

Divide

$3$ by

$1$ .

$3$

$3$

${}_{3}C_{1}$

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