Solve for the 11th Term in Sequence: 2, 5, 8, ...

Assuming the sequence continues according to the same rule, what number appears in the 11th element?

2,5,8 2,5,8\ldots

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the 11th term
00:03 This is the sequence formula
00:07 Let's substitute the appropriate term position in the formula and solve
00:13 Always solve multiplication and division before addition and subtraction
00:16 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Assuming the sequence continues according to the same rule, what number appears in the 11th element?

2,5,8 2,5,8\ldots

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the rule of the sequence
  • Step 2: Use the rule to find the 11th term

Now, let's work through each step:
Step 1: The given sequence starts with 2, 5, 8. We determine the pattern by finding the difference between consecutive terms:
52=3 5 - 2 = 3 and 85=3 8 - 5 = 3 so the common difference (d d ) is 3.
This indicates it is an arithmetic sequence with a1=2 a_1 = 2 and d=3 d = 3 .

Step 2: Use the arithmetic sequence formula to find the 11th term a11 a_{11} :
an=a1+(n1)d a_n = a_1 + (n-1)d
Substitute the known values:\
a11=2+(111)3 a_{11} = 2 + (11-1) \cdot 3
a11=2+103 a_{11} = 2 + 10 \cdot 3
a11=2+30 a_{11} = 2 + 30
a11=32 a_{11} = 32

Therefore, the 11th element in the sequence is 32 32 , which corresponds to choice 32 32 .

3

Final Answer

32

Practice Quiz

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Is there a term-to-term rule for the sequence below?

18 , 22 , 26 , 30

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