Arithmetic and Geometric Sequences Quiz

Which of the following sequences is an arithmetic sequence?

• 2, 5, 8, 11, 14

• 3, 6, 12, 24, 48

• 1, 2, 4, 8, 16

• 5, 15, 30, 50, 75

Find the 10th term of the arithmetic sequence: 7, 11, 15, 19, ...

• 39

• 43

• 47

• 51

In an arithmetic sequence, the first term is 3 and the common difference is 5. What is the 12th term?

• 58

• 63

• 67

• 73

Find the common difference of the arithmetic sequence: -4, 2, 8, 14, ...

• 4

• 6

• 2

• 5

Which term of the arithmetic sequence 5, 12, 19, 26, ... is equal to 89?

• 11th term

• 12th term

• 13th term

• 15th term

If the 5th term of an arithmetic sequence is 18 and the 10th term is 38, find the common difference.

• 3

• 4

• 5

• 6

Insert three arithmetic means between 6 and 18.

• 8, 10, 12

• 9, 12, 15

• 10, 12, 14

• 9, 11, 13

Find the sum of the first 20 terms of the arithmetic sequence: 2, 7, 12, 17, ...

• 950

• 990

• 1,000

• 1,050

If the 3rd term of an arithmetic sequence is 10 and the 8th term is 30, find the 12th term.

• 46

• 50

• 54

• 60

Which formula represents the sum of the first n terms of an arithmetic sequence?

• Sn = n/2([a+(n−1)d]

• Sn = a⋅rn−1

• Sn = a(1−rn)/1−r ​

• Sn = a + (n−1)d