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Determine the values of [tex]\( C \)[/tex] and [tex]\( D \)[/tex].

[tex]\[
\begin{array}{c}
C=\frac{7!-6!}{5!}+\frac{6!-5!}{4!}+\ldots+\frac{2!-1!}{0!} \\
D=\frac{0!+1!+2!+3!}{4!-4}
\end{array}
\][/tex]


Sagot :

Vamos a resolver los valores de [tex]\( C \)[/tex] y [tex]\( D \)[/tex] por partes.

Valor de [tex]\( C \)[/tex]:

El valor de [tex]\( C \)[/tex] está dado por la sumatoria siguiente:
[tex]\[ C = \sum_{i=2}^{7} \frac{i! - (i-1)!}{(i-2)!} \][/tex]

Expandamos los términos:
[tex]\[ C = \frac{2! - 1!}{0!} + \frac{3! - 2!}{1!} + \frac{4! - 3!}{2!} + \frac{5! - 4!}{3!} + \frac{6! - 5!}{4!} + \frac{7! - 6!}{5!} \][/tex]

- Para [tex]\( i = 2 \)[/tex]:
[tex]\[ \frac{2! - 1!}{0!} = \frac{2 - 1}{1} = 1 \][/tex]

- Para [tex]\( i = 3 \)[/tex]:
[tex]\[ \frac{3! - 2!}{1!} = \frac{6 - 2}{1} = 4 \][/tex]

- Para [tex]\( i = 4 \)[/tex]:
[tex]\[ \frac{4! - 3!}{2!} = \frac{24 - 6}{2} = 9 \][/tex]

- Para [tex]\( i = 5 \)[/tex]:
[tex]\[ \frac{5! - 4!}{3!} = \frac{120 - 24}{6} = 16 \][/tex]

- Para [tex]\( i = 6 \)[/tex]:
[tex]\[ \frac{6! - 5!}{4!} = \frac{720 - 120}{24} = 25 \][/tex]

- Para [tex]\( i = 7 \)[/tex]:
[tex]\[ \frac{7! - 6!}{5!} = \frac{5040 - 720}{120} = 36 \][/tex]

Entonces sumamos todos los términos:
[tex]\[ C = 1 + 4 + 9 + 16 + 25 + 36 = 91 \][/tex]

Por lo tanto, [tex]\( C = 91 \)[/tex].

Valor de [tex]\( D \)[/tex]:

El valor de [tex]\( D \)[/tex] está dado por:
[tex]\[ D = \frac{0! + 1! + 2! + 3!}{4! - 4} \][/tex]

Calculamos los valores factoriales:
[tex]\[ 0! = 1, \quad 1! = 1, \quad 2! = 2, \quad 3! = 6 \][/tex]
[tex]\[ 0! + 1! + 2! + 3! = 1 + 1 + 2 + 6 = 10 \][/tex]

Y para el denominador:
[tex]\[ 4! = 24 \][/tex]
[tex]\[ 4! - 4 = 24 - 4 = 20 \][/tex]

Entonces:
[tex]\[ D = \frac{10}{20} = \frac{1}{2} = 0.5 \][/tex]

Por lo tanto, [tex]\( D = 0.5 \)[/tex].

Conclusión:
[tex]\[ C = 91 \quad \text{y} \quad D = 0.5 \][/tex]
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