Math Problem Statement

A company that makes crayons is trying to decide which 4 colors to include in a promotional mini-box of 4 crayons. The company can choose the 4 mini-box colors from its collection of 65 colors. How many mini-boxes are possible?

Solution

This problem involves finding how many ways we can choose 4 colors from a collection of 65 colors. Since the order in which we choose the colors doesn't matter, we need to use the combination formula.

The formula for combinations is given by:

C(n,r)=n!r!(nr)!C(n, r) = \frac{n!}{r!(n - r)!}

where:

  • nn is the total number of items (in this case, 65 colors),
  • rr is the number of items to choose (in this case, 4 colors),
  • !! denotes factorial (the product of all positive integers up to that number).

Substituting the values into the formula:

C(65,4)=65!4!(654)!=65!4!×61!C(65, 4) = \frac{65!}{4!(65 - 4)!} = \frac{65!}{4! \times 61!}

We can cancel the 61!61! from the numerator and denominator, which simplifies to:

C(65,4)=65×64×63×624×3×2×1C(65, 4) = \frac{65 \times 64 \times 63 \times 62}{4 \times 3 \times 2 \times 1}

Now let's calculate this:

65×64=416065 \times 64 = 4160 4160×63=2620804160 \times 63 = 262080 262080×62=16248960262080 \times 62 = 16248960 4×3=124 \times 3 = 12 12×2=2412 \times 2 = 24 1624896024=677040\frac{16248960}{24} = 677040

Therefore, the number of possible mini-boxes is:

677,040677,040

Answer:

The company can create 677,040 different mini-boxes of 4 crayons.

Would you like further details on how this was calculated or have any questions?


Here are some related questions you might find interesting:

  1. What if the company wanted to create a mini-box with 5 crayons instead of 4?
  2. How many combinations would there be if the company had only 50 colors available instead of 65?
  3. How many ways could they select 3 colors from the 65?
  4. What if the order of colors mattered? How would the number of possible mini-boxes change?
  5. How would the solution change if we had to pick a specific color for the first crayon?

Tip: In problems where order doesn't matter, use combinations. When order matters, use permutations.

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Math Problem Analysis

Mathematical Concepts

Combinatorics
Combinations

Formulas

Combination formula: C(n, r) = n! / [r!(n - r)!]

Theorems

Basic principles of combinations in combinatorics

Suitable Grade Level

Grades 9-12