Finite Math Examples

${}_{9}P_{6}$

Step 1

Evaluate

${}_{9}P_{6}$ using the formula

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

$\frac{9!}{(9 - 6)!}$

Step 2

Subtract

$6$ from

$9$ .

$\frac{9!}{(3)!}$

Step 3

Simplify

$\frac{9!}{(3)!}$ .

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Step 3.1

Rewrite

$9!$ as

$9 \cdot 8 \cdot 7 \cdot 6 \cdot 5 \cdot 4 \cdot 3!$ .

$\frac{9 \cdot 8 \cdot 7 \cdot 6 \cdot 5 \cdot 4 \cdot 3!}{(3)!}$

Step 3.2

Cancel the common factor of

$3!$ .

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Step 3.2.1

Cancel the common factor.

$\frac{9 \cdot 8 \cdot 7 \cdot 6 \cdot 5 \cdot 4 \cdot 3!}{(3)!}$

Step 3.2.2

Divide

$9 \cdot 8 \cdot 7 \cdot 6 \cdot 5 \cdot 4$ by

$1$ .

$9 \cdot 8 \cdot 7 \cdot 6 \cdot 5 \cdot 4$

Step 3.3

Multiply

$9 \cdot 8 \cdot 7 \cdot 6 \cdot 5 \cdot 4$ .

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Step 3.3.1

Multiply

$9$ by

$8$ .

$72 \cdot 7 \cdot 6 \cdot 5 \cdot 4$

Step 3.3.2

Multiply

$72$ by

$7$ .

$504 \cdot 6 \cdot 5 \cdot 4$

Step 3.3.3

Multiply

$504$ by

$6$ .

$3024 \cdot 5 \cdot 4$

Step 3.3.4

Multiply

$3024$ by

$5$ .

$15120 \cdot 4$

Step 3.3.5

Multiply

$15120$ by

$4$ .

$60480$

${}_{9}P_{6}$

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