Turner Mills
11/02/2023 · Senior High School
12) \( a_{n}=\frac{(5 n)!}{25^{n}(2 n)!(3 n)!} \)
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Berilgan ketma-ketlik:
\[
a_{n} = \frac{(5 n)!}{25^{n}(2 n)!(3 n)!}
\]
Bu ketma-ketlikni tahlil qilish uchun, avvalo, uning umumiy ko'rinishini va xususiyatlarini ko'rib chiqamiz.
Bu formulada \( (5n)! \) faktoriali, \( 25^n \) koeffitsienti va \( (2n)! \) va \( (3n)! \) faktorialari mavjud. Bu turdagi ketma-ketliklar ko'pincha kombinatorik yoki geometrik ma'noga ega bo'lishi mumkin.
### 1. Asimptotik tahlil
Ketma-ketlikning asimptotik xususiyatlarini o'rganish uchun Stirling formulasi yordamida faktoriallarni taxmin qilishimiz mumkin:
\[
n! \sim \sqrt{2 \pi n} \left( \frac{n}{e} \right)^n
\]
Bu formulani qo'llab, \( a_n \) ni asimptotik tahlil qilamiz:
\[
(5n)! \sim \sqrt{10 \pi n} \left( \frac{5n}{e} \right)^{5n}
\]
\[
(2n)! \sim \sqrt{4 \pi n} \left( \frac{2n}{e} \right)^{2n}
\]
\[
(3n)! \sim \sqrt{6 \pi n} \left( \frac{3n}{e} \right)^{3n}
\]
Shunday qilib, \( a_n \) ni quyidagicha yozishimiz mumkin:
\[
a_n \sim \frac{\sqrt{10 \pi n} \left( \frac{5n}{e} \right)^{5n}}{25^n \cdot \sqrt{4 \pi n} \left( \frac{2n}{e} \right)^{2n} \cdot \sqrt{6 \pi n} \left( \frac{3n}{e} \right)^{3n}}
\]
Bu ifodani soddalashtirib, \( n \) ga bog'liq bo'lgan qismlarni ajratib ko'rishimiz mumkin.
### 2. Ketma-ketlikning chegarasi
Ketma-ketlikning chegarasini aniqlash uchun, \( n \) ni cheksizga olib boramiz. Agar \( a_n \) ning chegarasi mavjud bo'lsa, u holda:
\[
\lim_{n \to \infty} a_n
\]
ni hisoblashimiz kerak. Bu hisoblashlar natijasida \( a_n \) ning chegarasi yoki konvergensiya xususiyatlarini aniqlashimiz mumkin.
### 3. Xulosa
Bu ketma-ketlik kombinatorik ko'rinishga ega bo'lib, u ko'plab matematik muammolarni yechishda, masalan, kombinatorik hisoblashlar yoki ehtimollik nazariyasida qo'llanilishi mumkin. Agar sizga bu ketma-ketlik haqida qo'shimcha ma'lumot yoki aniq bir savol kerak bo'lsa, iltimos, so'rang!
Quick Answer
Bu ketma-ketlik \( a_{n}=\frac{(5 n)!}{25^{n}(2 n)!(3 n)!} \) kombinatorik yoki geometrik ma'noga ega bo'lishi mumkin. Uning asimptotik xususiyatlari va chegarasi aniqlanishi mumkin.
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