DP1.2 - Sequences and Series - Test n°1

The first term of a geometric sequence is 3. The common ratio is -2. List the first four terms.

The first term of an arithmetic sequence is 2. The common difference is 5. Find the simplified explicit formula for the n^th term. (i.e., u_n = __________)

• 53.07

• 48.6

• 26.07

• 1.8

Evaluate the sum shown here.

• 49

• 98

• 140

• 203

What is the common difference inthe sequence -7, -5, -3, -1, … ?

• 1/2

• -1/2

• 2

• -2

The next term of the sequence 2,4,8,16 is

• 64

• 32

• 108

• 20

a₁=5, a₂=11, a₁₅=?

• 95
• 89
• 81
• 159

Describe the sequence, find the 5th term, and write the rule

-8, -6, -4, -2...

• geometric, a₅ = 2, a_n = 2n - 10

• geometric, a₅ = 0, a_n = -10n + 2

• arithmetic, a₅ = 2, a_n = -10n + 2

• arithmetic, a₅ = 0, a_n = 2n - 10

Is the sequence 2, 4, 12, 48,... geometric?

• yes
• no

What is the common ratio of the geometric sequence below?
5, 25, 125, 625...

• 25
• 20
• 5
• 4