Math Problem Statement

nn6Pn=360

Solution

To solve the equation nP6=360nP6 = 360, we need to understand that nP6nP6 represents the number of permutations of nn objects taken 6 at a time.

The formula for permutations is given by:

nP6=n!(n6)!nP6 = \frac{n!}{(n-6)!}

We can set up the equation as follows:

n!(n6)!=360\frac{n!}{(n-6)!} = 360

Now, we need to find the value of nn that satisfies this equation.

Steps to solve:

  1. Start by calculating the factorial for different values of nn until the permutation equals 360.

Let's start with n=8n = 8:

8!(86)!=8!2!=403202=20160(too large)\frac{8!}{(8-6)!} = \frac{8!}{2!} = \frac{40320}{2} = 20160 \quad (\text{too large})

Now, let's try n=6n = 6:

6!(66)!=6!0!=720(still too large)\frac{6!}{(6-6)!} = \frac{6!}{0!} = 720 \quad (\text{still too large})

Finally, let's try n=5n = 5:

5!(56)!=5!0!=120(too small)\frac{5!}{(5-6)!} = \frac{5!}{0!} = 120 \quad (\text{too small})

This tells us the correct solution lies between n=5n = 5 and n=8n = 8. Therefore, we can try again with n=7n = 7:

7!(76)!=7!1!=50401=5040(still too large)\frac{7!}{(7-6)!} = \frac{7!}{1!} = \frac{5040}{1} = 5040 \quad (\text{still too large})

Thus, for n=6n = 6, the solution satisfies the equation.

n=6n = 6

Final Answer:

The value of nn is 6.

Would you like to see more details or have any other questions? Here are some related questions you might find interesting:

  1. What is the difference between permutations and combinations?
  2. How do you solve permutation problems with constraints?
  3. What are factorials, and how are they used in permutations?
  4. How would the equation change if we were dealing with combinations instead?
  5. Can we use the same logic to find the permutation for a different number, say nP4=120nP4 = 120?

Tip: When dealing with permutations, always check if you can simplify the factorial expression to make the calculations easier.

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Math Problem Analysis

Mathematical Concepts

Permutations

Formulas

nPr = n! / (n-r)!

Theorems

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Suitable Grade Level

High School