Unit Test #18

Select your answers to the following 10 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.

 

 

Q1:

 

Is the following a geometric series?

3 + 9 + 18 + 30

A. Yes
B. No

Answer 1:

 

 

Q2:

 

What is the sum of the first 8 terms of the geometric sequence

    3, 6, 12, 24, ...?

A. 765
B. 768
C. 255
D. 382.5

Answer 2:

 

 

Q3:

 

The first three terms of a geometric sequence are 80, 40 and 20. What is the sum of the first 12th terms?

A.159.96
B. 960
C. 480
D. 39.375

Answer 3:

 

 

Q4:

 

The sum to infinity of the geometric sequence 1, 0.5, 0.25 ...is

A. 2
B. 3
C. 3.5
D. infinity

Answer 4:

 

 

Q5:

 

.

How many matches would there be altogether in the first 7 patterns?

A. 112
B. 256
C. 512
D. 508

Answer 5:

 

 

Q6:

 

The first term of a geometric progression is 0.5 and the common ratio is 2. Find the sum of the first six terms. A. 15
B. 15.5
C. 16
D. 31.5

Answer 6:

 

 

Q7:

 

What is the sum to infinity of 1000 + 500 + 250...?

A.1900 
B. 3000
C. 1760
D. 2000

Answer 7:

 

 

Q8:

 

What name is given to the symbol Σ ? A. gamma
B. beta
C. sigma
D. alpha

Answer 8:

 

 

Q9:

 

Find the sum of the first 99 terms of the sequence 1, -1, 1, -1...

A. 0
B. 1
C. -1
D. 2

Answer 9:

 

 

Q10:

 

Find the sum of the first 5 terms of the sequence < 3 n > A. 121
B. 242
C. 363
D. 726

Answer 10: