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\( \begin{array}{l}\text { What does the following } \\ \text { expression mean? } \\ 7 \text { ! } \\ 7+6+5+4+3+2+1 \\ 7 \cdot 6 \cdot 5 \cdot 4 \cdot 3 \cdot 2 \cdot 1\end{array} \) 7

Ask by Cruz Savage. in the United States
Jan 27,2025

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Answer

La expresión \(7!\) significa el factorial de 7, que es \(7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 = 5040\).

Solution

La expresión presentada se refiere al **factorial de 7**, representado por \(7!\). A continuación, se explica cada una de las partes: 1. **\(7!\)**: - **Significado**: El factorial de un número entero positivo \(n\) (denotado como \(n!\)) es el producto de todos los enteros positivos desde 1 hasta \(n\). - **Para \(7!\)**: \[ 7! = 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 = 5040 \] 2. **\(7 + 6 + 5 + 4 + 3 + 2 + 1\)**: - **Significado**: Esta expresión representa la **suma de los primeros 7 números enteros positivos**. - **Cálculo**: \[ 7 + 6 + 5 + 4 + 3 + 2 + 1 = 28 \] - **Nota**: Esta suma no es igual al factorial de 7, ya que uno es una suma y el otro es un producto. 3. **\(7 \cdot 6 \cdot 5 \cdot 4 \cdot 3 \cdot 2 \cdot 1\)**: - **Significado**: Esta es una representación explícita del **factorial de 7**, mostrando la multiplicación de todos los números desde 1 hasta 7. - **Cálculo**: \[ 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 = 5040 \] 4. **Número 7**: - Simplemente indica el valor base para calcular el factorial, la suma o el producto mencionado anteriormente. **Resumen**: - **\(7!\)** (7 factorial) es igual a **5040** y representa el producto de todos los enteros positivos desde 1 hasta 7. - La suma **\(7 + 6 + 5 + 4 + 3 + 2 + 1\)** es **28**, que es una operación diferente al factorial. - La expresión multiplicativa **\(7 \cdot 6 \cdot 5 \cdot 4 \cdot 3 \cdot 2 \cdot 1\)** también representa el factorial de 7, dando como resultado **5040**. El factorial se utiliza en diversas áreas de las matemáticas, como en cálculos de combinatorias, probabilidades y análisis de algoritmos.

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The Deep Dive

The expression \( 7! \) represents the factorial of 7, which is a mathematical operation used to calculate the product of all positive integers up to 7. This means you multiply 7 by every whole number less than it, specifically \( 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 \), resulting in 5040. Factorials are commonly found in permutations, combinations, and other areas of combinatorial mathematics. Factorials are super useful when you're dealing with arrangements and combinations! For example, if you want to know how many ways to arrange 7 different books on a shelf, you would use \( 7! \). If you're not careful and forget to start at 7 or skip any numbers, your final count could be wildly incorrect, so always double-check those multiplications and ensure you include every integer down to 1!

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