4).  Find an explicit formula an for the nth term of the geometric sequence whose first term is a1 = 4 such that an + 1 an =  1 10for n ≥ 1. an =   please show step by step .

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
Section: Chapter Questions
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4). 

Find an explicit formula
an
for the nth term of the geometric sequence whose first term is
a1 = 4
such that
an + 1
an
 = 
1
10
for
n ≥ 1.
an
=
 
please show step by step . 
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