Geometric Mean/Series Quiz

Given 12, 24, 48, 96, 192 how do we call the numbers between 12 and 192?

• arithmetic mean

• Fibonacci mean

• harmonic mean

• geometric mean

What type of sequence is 72, 36, 18, 9, 9/2 , … ?

• finite arithmetic sequence

• finite geometric sequence

• infinite arithmetic sequence

• infinite geometric sequence

What is the next term in the geometric sequence -12, 36, -108, ?

• 323

• -323

• 324

• -324

If three geometric means are inserted between 2 and 13122, find the fourth term.

• 145

• 458

• 1458

• 4581

Find the sum of the geometric sequence where the first term is 2, the last term 6 250, and the common ratio is 5.

• 7812

• 812

• 781

• 681

What is the geometric mean between 4 and 64?

• 4

• 64

• 16

• 256

Find the sum of the 5 terms of the finite geometric sequence, 96, -48, 24, -12, …

• 56

• -56

• 66

• -66

if a₁ = 4, r = 2 and a_n = 128, what is n?

• 4

• 5

• 6

• 7

if a₁ = 4, r = 2 and n = 6, What is S_n?

• 508

• 252

• 124

• 60

Find the sum of an infinite geometric series if a₁ = 6 and r = 1/3.

• 2

• 6

• 9

• 18