Select the correct option that will fill in the blank and complete the series.
79
Solving the Number Series Pattern
Let's analyze the given number series: 23, 34, 47, 62, ______
To find the next number in the series, we need to identify the pattern or the rule that connects consecutive terms.
Let's calculate the difference between each pair of consecutive terms:
- Difference between the 2nd term (34) and the 1st term (23): $34 - 23 = 11$
- Difference between the 3rd term (47) and the 2nd term (34): $47 - 34 = 13$
- Difference between the 4th term (62) and the 3rd term (47): $62 - 47 = 15$
The differences we found are 11, 13, and 15.
Now, let's look at the pattern in these differences:
- From 11 to 13, the increase is $13 - 11 = 2$.
- From 13 to 15, the increase is $15 - 13 = 2$.
It appears that the differences between consecutive terms are increasing by 2 each time. This is a series with a second-order arithmetic progression.
Following this pattern, the next difference should be $15 + 2 = 17$.
To find the next term in the original series, we add this next difference (17) to the last term given (62).
Next term $= 62 + 17 = 79$.
So, the missing number in the series is 79.
Summary of the Number Series Logic
The pattern observed is that the difference between successive terms increases by a constant value (which is 2 in this case).
| Term | Value | Difference from Previous Term |
|---|---|---|
| 1st | 23 | - |
| 2nd | 34 | $34 - 23 = 11$ |
| 3rd | 47 | $47 - 34 = 13$ |
| 4th | 62 | $62 - 47 = 15$ |
| 5th | ? | Next Difference ($15 + 2 = 17$) |
The next term is $62 + 17 = 79$.
Revision Table: Key Concepts
| Concept | Description | Application in Series |
|---|---|---|
| Number Series | A sequence of numbers following a specific pattern. | The given sequence: 23, 34, 47, 62, ... |
| Difference Method | Finding the pattern by calculating the difference between consecutive terms. | Differences: 11, 13, 15. |
| Second-Order Pattern | When the differences between terms themselves form a pattern (like an arithmetic progression). | The differences (11, 13, 15) have a constant difference of 2. |
Additional Information: Types of Number Series Patterns
Number series questions often involve various patterns. Some common types include:
- Arithmetic Progression: Each term is obtained by adding a constant value to the previous term (constant difference). Example: 2, 4, 6, 8, ... (difference is 2).
- Geometric Progression: Each term is obtained by multiplying the previous term by a constant value (constant ratio). Example: 2, 4, 8, 16, ... (ratio is 2).
- Difference Series: The differences between consecutive terms follow a specific pattern (as seen in this problem). This could be an arithmetic progression, geometric progression, squares, cubes, etc.
- Square or Cube Series: Terms are squares or cubes of natural numbers or follow a pattern based on squares or cubes. Example: 1, 4, 9, 16, ... (squares of 1, 2, 3, 4).
- Mixed Series: A combination of different patterns or rules.
- Fibonacci Series: Each term is the sum of the two preceding terms. Example: 0, 1, 1, 2, 3, 5, 8, ...
Solving number series problems often requires careful observation, calculating differences or ratios, and testing different potential patterns.
Important Questions from Number Series
Select the number from among the given options that can replace the question mark (?) in the following series.
37, 52, 74, 104, 143, ?
Select the number that can replace the question mark (?) in the following series.
17, 19, 22, 27, 34, 45, 58,?Select the number from among the given options that can replace the question mark (?) in the following series.
10, 14, 31, 35, 73, 77, ?
Select the number from among the given options that can replace the question mark (?) in the following series.
215, 231, 256, 292, ?
Select the number from among the given options that can replace the question mark (?) in the following series.
6, 6, 8, 24, 28, 140, ?
