Geometric Sequence Quiz

Which explicit formula represents the geometric sequence shown?

2, -10, 50, -250

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Find the common ratio for the geometric sequence.

• 1
• -1
• 7
• -7

Write the explicit formula for the geometric sequence.

• a_n = 7(1)ⁿ
• a_n = 7(-1)ⁿ
• a_n = 7(-1)^n-1
• a_n = -1(7)^n-1

Find the common ratio for the geometric sequence.

• -4
• 4
• 1/4
• -1/4

Write the explicit formula for the geometric sequence.

• a_n = 4(3)^n-1
• a_n = 3(4)^n-1
• a_n = -4(3)^n-1
• a_n = 3(-4)^n-1

Write the explicit formula for the geometric sequence.

• a_n = 162(2/3)^n-1
• a_n = (2/3)(162)^n-1
• a_n = 162(3/2)^n-1
• a_n = 162 + (n-1)(-54)

What does r represent?

• Radical

• Common difference

• Common ratio

What does a₁ represent?

• Any term

• First term

• Last term

Find the common ratio for the geometric sequence.

• 10
• 1/2
• 2
• 4

Write the explicit formula for the geometric sequence.

• a_n = 4(3)^n-1
• a_n = 3(4)^n-1
• a_n = -4(3)^n-1
• a_n = 3(-4)^n-1