Exponential Growth Analysis: Identifying Properties in the Set 2, 4, 8, 16, 32, 64

Geometric Sequences with Powers of Two

Look at the following set of numbers and determine if there is any property, if so, what is it?

2,4,8,16,32,64 2,4,8,16,32,64

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Is there any pattern? If so, what is it?
00:03 Let's observe the change between terms
00:13 We can see that the pattern is constant and it's multiplying by 2
00:22 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Look at the following set of numbers and determine if there is any property, if so, what is it?

2,4,8,16,32,64 2,4,8,16,32,64

2

Step-by-step solution

To solve this problem, let's analyze the sequence of numbers given: 2,4,8,16,32,64 2, 4, 8, 16, 32, 64 .

First, let's calculate the ratio between each pair of consecutive terms in the sequence:

  • The ratio of the second term 4 4 to the first term 2 2 is 42=2\frac{4}{2} = 2.
  • The ratio of the third term 8 8 to the second term 4 4 is 84=2\frac{8}{4} = 2.
  • The ratio of the fourth term 16 16 to the third term 8 8 is 168=2\frac{16}{8} = 2.
  • The ratio of the fifth term 32 32 to the fourth term 16 16 is 3216=2\frac{32}{16} = 2.
  • The ratio of the sixth term 64 64 to the fifth term 32 32 is 6432=2\frac{64}{32} = 2.

Each consecutive term is obtained by multiplying the previous term by 2 2 . Therefore, this sequence is a geometric sequence where each term is ×2\times 2 times the preceding term.

This consistent multiplication factor shows that the sequence's property is that of a geometric progression with a common ratio r=2 r = 2 .

In conclusion, the identified property of the sequence is that each term is multiplied by 2 2 , which is option ×2 \times 2 .

3

Final Answer

×2 \times2

Key Points to Remember

Essential concepts to master this topic
  • Pattern Recognition: Each term equals previous term multiplied by constant ratio
  • Method: Calculate ratios: 4÷2=2, 8÷4=2, 16÷8=2 shows ×2 pattern
  • Verification: Check all consecutive ratios are equal: 2, 2, 2, 2, 2 ✓

Common Mistakes

Avoid these frequent errors
  • Looking for additive patterns instead of multiplicative
    Don't check differences like 4-2=2, 8-4=4 and think it's +2 pattern = wrong answer! The differences aren't constant (2, 4, 8, 16, 32), so it's not arithmetic. Always check ratios first for geometric sequences.

Practice Quiz

Test your knowledge with interactive questions

12 ☐ 10 ☐ 8 7 6 5 4 3 2 1

Which numbers are missing from the sequence so that the sequence has a term-to-term rule?

FAQ

Everything you need to know about this question

How do I tell if a sequence is geometric or arithmetic?

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Check differences first (arithmetic) then ratios (geometric). If differences are constant, it's arithmetic (+/-). If ratios are constant, it's geometric (×/÷).

What if I get different ratios for some terms?

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Then it's not a geometric sequence! All consecutive ratios must be exactly the same for a true geometric pattern. Double-check your division.

Can the common ratio be a fraction or negative?

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Yes! Common ratios can be any number. Fraction ratios make sequences decrease (like ×1/2), and negative ratios make terms alternate signs.

Why is this sequence special with powers of 2?

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This sequence shows 21,22,23,24,25,26 2^1, 2^2, 2^3, 2^4, 2^5, 2^6 . It's a geometric sequence where each term is a power of 2, making the common ratio exactly 2.

How do I find the next term in this sequence?

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Multiply the last term by the common ratio: 64×2=128 64 \times 2 = 128 . The pattern continues: multiply by 2 to get the next term.

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