Question
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d \( \frac{x!}{(x-2)!}= \) e) \( \frac{6!}{5!-2!}= \) f) \( \frac{8!}{4!\cdot 6!} \)

Ask by Horton Ortiz. in Mozambique
Mar 13,2025

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Tutor-Verified Answer

Answer

d) \( x \cdot (x - 1) \) e) \( \frac{360}{59} \) f) \( \frac{7}{3} \)

Solution

d) Para simplificar \(\frac{x!}{(x-2)!}\), note que: \[ x! = x \cdot (x-1) \cdot (x-2)! \] Assim, \[ \frac{x!}{(x-2)!} = \frac{x\cdot (x-1)\cdot (x-2)!}{(x-2)!} = x\cdot (x-1) \] --- e) Primeiramente, calculamos os fatoriais: \[ 6! = 720,\quad 5! = 120,\quad 2! = 2 \] Substituindo na expressão: \[ \frac{6!}{5! - 2!} = \frac{720}{120 - 2} = \frac{720}{118} \] Dividindo numerador e denominador por 2, obtemos: \[ \frac{720}{118} = \frac{360}{59} \] --- f) Para a expressão \(\frac{8!}{4! \cdot 6!}\), calculamos cada fatorial: \[ 8! = 40320,\quad 4! = 24,\quad 6! = 720 \] Multiplicando \(4!\) por \(6!\): \[ 4! \cdot 6! = 24 \cdot 720 = 17280 \] Assim, \[ \frac{8!}{4! \cdot 6!} = \frac{40320}{17280} \] Dividindo numerador e denominador por 24: \[ \frac{40320 \div 24}{17280 \div 24} = \frac{1680}{720} \] Simplificando dividindo por 240: \[ \frac{1680 \div 240}{720 \div 240} = \frac{7}{3} \]

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The Deep Dive

Let’s have some fun breaking this down! To simplify \( \frac{x!}{(x-2)!} \), we notice that \( x! = x \cdot (x-1) \cdot (x-2)! \). So, when we divide \( x! \) by \( (x-2)! \), all the \( (x-2)! \) in the numerator and denominator cancels out, leaving us with \( x(x-1) \). Now, for \( \frac{6!}{5!-2!} \), we first know that \( 5! = 120 \) and \( 2! = 2 \). Thus, \( 5! - 2! = 120 - 2 = 118 \). When we calculate \( \frac{720}{118} \) (since \( 6! = 720 \)), we find approximately \( 6.10 \). Lastly, \( \frac{8!}{4! \cdot 6!} \) is a combination formula in disguise! The value of \( 8! = 40320 \) while \( 4! = 24 \) and \( 6! = 720 \). Putting these together gives us \( \frac{40320}{24 \cdot 720} \), which simplifies to \( \frac{40320}{17280} = 2.333 \) or \( \frac{7}{3} \) in fractional form!

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