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Question

Find the number which will complete the following series.

0, 1, 8, 27, ?

This question was previously asked in
RRB ALP 2018 CBT 2 Fitter Question Paper (21-Jan-2019) (Shift 3)
The correct answer is

64

Solving the Number Series: Finding the Next Term

The question asks us to find the next number in the given series: 0, 1, 8, 27, ?

Let's carefully examine the numbers in the series to identify a pattern or rule that connects them.

  • The first term is 0.
  • The second term is 1.
  • The third term is 8.
  • The fourth term is 27.
  • We need to find the fifth term.

Let's try to relate these numbers to simple mathematical operations like addition, subtraction, multiplication, division, squares, cubes, etc.

Consider the cubes of consecutive integers starting from 0:

  • $0^3 = 0 \times 0 \times 0 = 0$
  • $1^3 = 1 \times 1 \times 1 = 1$
  • $2^3 = 2 \times 2 \times 2 = 8$
  • $3^3 = 3 \times 3 \times 3 = 27$

We can see that each term in the given series is the cube of a consecutive integer, starting with the cube of 0 for the first term, the cube of 1 for the second term, the cube of 2 for the third, and the cube of 3 for the fourth.

Following this pattern, the next term in the series should be the cube of the next consecutive integer, which is 4.

Calculating the fifth term:

$4^3 = 4 \times 4 \times 4 = 16 \times 4 = 64$

Therefore, the number that completes the series is 64.

Let's present the pattern in a table:

Term Position Integer Pattern Term Value
1st 0 $0^3$ 0
2nd 1 $1^3$ 1
3rd 2 $2^3$ 8
4th 3 $3^3$ 27
5th 4 $4^3$ 64

The completed series is 0, 1, 8, 27, 64.

Revision Table: Key Learnings from this Number Series

Concept Description Application in Series
Number Series A sequence of numbers following a specific rule or pattern. 0, 1, 8, 27, ? is a number series.
Identifying Pattern Analyzing terms to find the rule (e.g., arithmetic progression, geometric progression, squares, cubes, etc.). Recognizing terms as cubes of consecutive integers.
Cubes of Integers The result of multiplying an integer by itself three times ($n \times n \times n$ or $n^3$). The series is based on $n^3$ for $n = 0, 1, 2, 3, \dots$.

Additional Information on Number Series Patterns

Number series problems often test your ability to find underlying mathematical relationships. Common patterns include:

  • Arithmetic Series: Each term is obtained by adding a constant difference to the previous term (e.g., 2, 4, 6, 8...).
  • Geometric Series: Each term is obtained by multiplying the previous term by a constant ratio (e.g., 3, 9, 27, 81...).
  • Square Series: Terms are squares of consecutive numbers ($1^2, 2^2, 3^2, \dots$) or follow a pattern involving squares (e.g., $n^2 \pm c$).
  • Cube Series: Terms are cubes of consecutive numbers ($1^3, 2^3, 3^3, \dots$) or follow a pattern involving cubes (e.g., $n^3 \pm c$).
  • Fibonacci Series: Each term is the sum of the two preceding terms (e.g., 0, 1, 1, 2, 3, 5, 8...).
  • Mixed Patterns: Series might combine different operations or patterns, sometimes alternating between rules.

To solve number series questions, practice is key. Try calculating differences, ratios, or checking for squares/cubes of term positions or values.

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