Jika deret geomatri suku 2 adl 6 dan suku 5 adl 48 jumlah 10 suku pertama adl.... Question from @muhammadhasfi

October 2018 2 13 Report

Jika deret geomatri suku 2 adl 6 dan suku 5 adl 48 jumlah 10 suku pertama adl

2titania Ini jawaban mnurut saya

1 votes Thanks 0

MicoArrafi $\bigstar\ \bold{\underline{Solution\ best\ answer}}\ \bigstar$

Cari rasio :

$$\begin{align} \frac{a\times r^4}{a\times r}&=\frac{48}{6}\\r^{4-1}&=\frac{48}{6}\\r^3&=8\\r&=2 \end{align}$

Cari awal :

$$\begin{align} a\times r&=6\\a\times2&=6\\a&=3 \end{align}$

Maka, jumlah 10 suku pertama :

$$\begin{align} S_n&=\frac{a\ (\ r^n-1\ )}{r-1}\\S_{10}&=\frac{3\ (\ 2^{10}-1\ )}{2-1}\\&=\frac{3\times1.023}{1}\\&=\boxed{3.069} \end{align}$

1 votes Thanks 1

About Us

Life Enjoy

" Life is not a problem to be solved but a reality to be experienced! "

Terperangkapnya panas bumi oleh lapisan gas bumi disebut

Apa itu firmware ????????

Modal perum berasal dari

Recommend Questions

Life Enjoy

Get in touch

Social