Sunday, August 16, 2015

Determine whether the sequence converges or diverges. if it converges, find the limit. An=3^(n+2)/(5^n)

An = [3^(n+2)]/(5^n)


=
[3^(n+2)]/[(3*5/3)^n]


=
[3^(n+2)]/[(3^n)*(5/3)^n]


=
(3^2)/[(5/3)^n]


= (5/3)^n


As
5/3 is greater than 1, as value of n increases,


the value
of (5/3)^n also increases,


and value of 9/(5/3)^n
decreases.


Therefore, sequences An
converges.


To find value of limit of
An:


When n approaches
infinity:


Value of limit (5/3)^n becomes
infinity


and  value of limit 9/(5/3)^n
becomes:


9/(infinity) =
0


Answer:


Limit An =
[3^(n+2)]/(5^n) as n approaches infinity is 0

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