EXAMPLE 4 Find the sum of the series correct to three n! n=0 decimal places. (By definition, 0! = 1.)

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section9.4: Series And Their Notations
Problem 10TI: Determine whether the sum of the infinite series is defined. 24+(12)+6+(3)+
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Question
Find the sum of the series
(-1)" correct to three
EXAMPLE 4
n!
n = 0
decimal places. (By definition, 0! = 1.)
SOLUTION We first observe that the series is convergent by the
Alternating Series Test because
(i)
1.
be +1
= b.
(n + 1)!
n!(n + 1):
n!
(ii)
1.
so b.
n!
%3D
as
n!
in
n - co.
To get a feel for how many terms we need to use in our approximation,
let's write out the first few terms of the series:
1
1
+
1!
2!
1.
S =
O!
+...
3!
4!
5!
6!
7!
1.
+
1
= 1 - 1 +
2
..
24
120
5040
Notice that
b, =
5040
5000
and
1
1
1
1
S6 = 1-1+
2.
720
+
24
120
(rounded to six decimal places).
By the Alternating Series Estimation Theorem we know that
Is - S6| s b, s 0.0002.
This error of less than 0.0002 does not affect the third decimal place, so
we have
Sx 0.368
correct to three decimal places.
Transcribed Image Text:Find the sum of the series (-1)" correct to three EXAMPLE 4 n! n = 0 decimal places. (By definition, 0! = 1.) SOLUTION We first observe that the series is convergent by the Alternating Series Test because (i) 1. be +1 = b. (n + 1)! n!(n + 1): n! (ii) 1. so b. n! %3D as n! in n - co. To get a feel for how many terms we need to use in our approximation, let's write out the first few terms of the series: 1 1 + 1! 2! 1. S = O! +... 3! 4! 5! 6! 7! 1. + 1 = 1 - 1 + 2 .. 24 120 5040 Notice that b, = 5040 5000 and 1 1 1 1 S6 = 1-1+ 2. 720 + 24 120 (rounded to six decimal places). By the Alternating Series Estimation Theorem we know that Is - S6| s b, s 0.0002. This error of less than 0.0002 does not affect the third decimal place, so we have Sx 0.368 correct to three decimal places.
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