Math Problem Statement

Evaluate 12P5

Solution

The problem in the image asks to evaluate the permutation 12P512P_5.

The formula for permutations is:

nPr=n!(nr)!nP_r = \frac{n!}{(n - r)!}

Where:

  • n!n! means "n factorial," the product of all positive integers from 1 to nn.
  • r!r! means "r factorial."
  • nPrnP_r is the number of ways to arrange rr objects from a set of nn.

For this case, n=12n = 12 and r=5r = 5, so we need to calculate 12P512P_5.

12P5=12!(125)!=12!7!12P_5 = \frac{12!}{(12 - 5)!} = \frac{12!}{7!}

Now, calculate the value:

12P5=12×11×10×9×8×7!7!12P_5 = \frac{12 \times 11 \times 10 \times 9 \times 8 \times 7!}{7!}

The 7!7! cancels out, so we are left with:

12P5=12×11×10×9×812P_5 = 12 \times 11 \times 10 \times 9 \times 8

Let's compute that.The value of 12P512P_5 is 95,040.

Thus, the correct answer is the first option: 95,040.

Would you like more details on this calculation or have any further questions?

Here are 5 related questions for practice:

  1. Evaluate 10P310P_3.
  2. What is the difference between permutations and combinations?
  3. How do you calculate nPrnP_r when nn and rr are very large?
  4. Calculate 7P47P_4.
  5. If a problem gives n=15n = 15 and r=6r = 6, what is 15P615P_6?

Tip: In permutations, the order of selection matters, unlike combinations where the order does not matter.

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Math Problem Analysis

Mathematical Concepts

Permutations
Factorial
Combinatorics

Formulas

nPr = n! / (n - r)!

Theorems

Permutation Theorem

Suitable Grade Level

Grades 10-12