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inna [77]
3 years ago
7

Geometric sequence help

Mathematics
1 answer:
My name is Ann [436]3 years ago
5 0
Hello,

First we must find the ratio:

r= \dfrac{ u_{2}}{ u_{1}} = \dfrac{20}{-5} =-4\\\\
r= \dfrac{ u_{3}}{ u_{2}} = \dfrac{-80}{20} =-4\\\\

u_{1}= -5\\
u_{2}= -5*(-4)\\
u_{3}= -5*(-4)^2\\
u_{4}= -5*(-4)^3\\

\boxed{u_{n}= -5*(-4)^{n-1}\\}\\\\
Answer\ B






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