Math Problem Statement

Evaluate. !7!5!/6!8 Simplify your answer as much as possible.

Solution

We are tasked with evaluating:

7!×5!6!×8!.\frac{7! \times 5!}{6! \times 8!}.

Step 1: Break down the factorial expressions.

We know the following factorial values:

  • 7!=7×6!7! = 7 \times 6!
  • 8!=8×7!8! = 8 \times 7!

So we can rewrite the expression as:

7!×5!6!×8!=7×6!×5!6!×8×7!.\frac{7! \times 5!}{6! \times 8!} = \frac{7 \times 6! \times 5!}{6! \times 8 \times 7!}.

Step 2: Cancel out common terms.

The 6!6! in both the numerator and the denominator cancel out:

7×5!8×7!.\frac{7 \times 5!}{8 \times 7!}.

Now, rewrite 7!7! as 7×6!7 \times 6!:

7×5!8×7×6!.\frac{7 \times 5!}{8 \times 7 \times 6!}.

The 77 in the numerator and denominator cancel out:

5!8×6!.\frac{5!}{8 \times 6!}.

Step 3: Evaluate the remaining factorials.

Now calculate 5!=1205! = 120 and 6!=7206! = 720:

1208×720.\frac{120}{8 \times 720}.

Simplify the denominator:

1205760.\frac{120}{5760}.

Step 4: Final simplification.

Now divide:

1205760=148.\frac{120}{5760} = \frac{1}{48}.

Final Answer:

148.\boxed{\frac{1}{48}}.

Would you like more details or have any questions about this?

Here are 5 related questions:

  1. What is the value of 9!9!?
  2. How do you simplify expressions involving factorials?
  3. What is the result of 5!×6!7!\frac{5! \times 6!}{7!}?
  4. How can we evaluate factorials for larger numbers efficiently?
  5. How does the factorial operation relate to combinatorics?

Tip: Cancel common terms early when working with factorials to simplify calculations.

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Math Problem Analysis

Mathematical Concepts

Factorials
Simplification of Fractions

Formulas

n! = n × (n-1) × (n-2) × ... × 1
Fraction simplification by canceling common factors

Theorems

Factorial properties
Cancellation of common terms in fractions

Suitable Grade Level

Grades 9-12