1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kogti [31]
3 years ago
12

Determine whether the alternating series E (-1)^n+1 (n/8)^n converges or diverges. Choose the correct answer below​ and, if​ nec

essary, fill in the answer box to complete your choice. A. The series does not satisfy the conditions of the Alternating Series Test but diverges because it is a​ p-series with pequals nothing. B. The series does not satisfy the conditions of the Alternating Series Test but converges because it is a​ p-series with pequals nothing. C. The series does not satisfy the conditions of the Alternating Series Test but diverges by the Root Test because the limit used does not exist. D. The series does not satisfy the conditions of the Alternating Series Test but converges because it is a geometric series with requals nothing. E. The series converges by the Alternating Series Test.
Mathematics
1 answer:
RUDIKE [14]3 years ago
8 0

Answer:

C

Step-by-step explanation:

Solution:-

- The Alternate series test is applicable for alternating series with has terms summed and subtracted alternatively and takes the form of:

       

                                   ∑ an

Were,

                                a_n = ( -1 ) ^(^n^+^1^) b_n

- Where, {  bn } > 0 for all n. Then if the following conditions are met:

1. Lim ( n -> ∞ ) { b_n } = 0

2. b ( n + 1 )  < bn  .... bn is a decreasing function.

Conclusion:- The series { ∑ an } is convergent.

- The following series is given as follows:

                                ∑  ( - 1 )^(^n^+^1^) (\frac{n}{8} )^n

Where,

                               b_n = (\frac{n}{8} )^n

1 . We will first test whether the sequence { bn } is decreasing or not. Hence,

                              b_n_+_1 - b_n < 0\\\\(\frac{n+1}{8})^(^n^+^1^) - (\frac{n}{8})^n\\\\(\frac{n}{8})^n ( \frac{n-7}{8} ) \\\\

We see that for n = 1 , 2 , 3 ... 6 the sequence { b_n } is decreasing; however, for n ≥ 7 the series increases. The condition is not met for all values of ( n ). Hence, the Alternating series test conditions are not satisfied.

We will now apply the root test that states that a series given in the following format:

                               ∑ an

- The limit of the following sequence { an } is a constant ( C ).

                               C = Lim ( n - > inf ) [ a_n ] ^\frac{1}{n} \\\\

1. C < 1 , The series converges

2.C > 1 , The series diverges

3. C = 1 , test is inconclusive

- We will compute the limit specified by the test as follows:

                          Lim ( n - >inf ) = [ (\frac{n}{8})^n ]^\frac{1}{n}   \\\\Lim ( n - >inf ) = [ (\frac{n}{8}) ] = inf   \\\\

- Here, the value of C = +∞ > 1. As per the Root test limit conditions we see that the series { ∑ an } diverges.

Note: Failing the conditions of Alternating Series test does not necessarily means the series diverges. As the test only implies the conditions of "convergence" and is quiet of about "divergence". Hence, we usually resort to other tests like { Ratio, Root or p-series tests for the complete picture }.

You might be interested in
Please help with this probability question! 
Pani-rosa [81]
The probability is all the numbers on the dice  added up under 6 so its 6/18 hope this helps :)

5 0
3 years ago
Read 2 more answers
4/x-7=7/x+6<br><br> What is x
marissa [1.9K]

Answer:

21

Step-by-step explanation:

4x + 24 = 7x - 49  \\ then \: collect \: the \: same \: variable \\ 4x - 7x =  - 49 - 24 \\ x =  - 63 \div  - 3 = 21

6 0
3 years ago
Solve the absolute value equation |2x-1|=3
SSSSS [86.1K]

x=2

sorry for the bad handwriting btw.

6 0
3 years ago
Read 2 more answers
A carton of juice contains. 64 ounces. Ms Wilson brought 6. of juice how many ounces of juice did she buy
kupik [55]

You multiply by 6

64 * 6 = 384

3 0
3 years ago
Read 2 more answers
PLZ HELP I DONT KNOW IT!!:(Polly uses a probability simulator to pull colored ribbons from a bag 60 times and to flip a coin 60
Vanyuwa [196]

the answer is i belive 462/3600 because the total amount of times a ribbon has been pulled is 60 and the total amount of times a coin was flipped was 60 times as well so you would do 21/60 times 22/60 which 462/3600Step-by-step explanation:

4 0
3 years ago
Other questions:
  • A rental company charges $75 a day and 20 cents a mile for renting a truck. michael rents a truck for 2 days, and his bill came
    14·2 answers
  • Anothony went out to eat dinner, and the meal cost $50.00. of Anthony received a 15% discount, what was th3 toy value of the dis
    5·1 answer
  • How much greater is 28.95 than 14.25?
    13·1 answer
  • Vector u has its initial point at (21, 12) and its terminal point at (19,-8). Vector v has a direction opposite that of u, whose
    12·1 answer
  • Four students were discussing how to find the unit rate for a proportional relationship. Which method is valid?
    14·1 answer
  • Find the coefficient of x^2 in the expression of (x - 7)^5. a. -3430 b. -3034 c. 3034 d. 3430
    11·2 answers
  • Which of the following is not a characteristic of the figure with vertices at coordinates A(1, 1), B(1, 2), C(2, 2), and D(2, 1)
    7·2 answers
  • If the point (12,-2) changes to (-12,-2) in what quadrant would it be located?
    6·1 answer
  • If ³√a=am , what is m​
    14·1 answer
  • Points that don't belong to any line​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!