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Question

(2, 14, 16), (3, 21, 24), (8, 56, 64), (5, 35, 41)
The set that does NOT belong to the group is:

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

(5, 35, 41)

Finding the Odd Set Out in Number Patterns

The question asks us to identify the set of numbers that does not follow the same pattern as the other sets provided. We are given four sets of three numbers:

  • (2, 14, 16)
  • (3, 21, 24)
  • (8, 56, 64)
  • (5, 35, 41)

Let's examine the first few sets to find a relationship between the numbers within each set. We can represent a general set as \((a, b, c)\).

Analyzing the Number Sets to Find the Pattern

Let's look at the first set, (2, 14, 16):

  • The second number, 14, is \(2 \times 7\). So, \(b = 7 \times a\).
  • The third number, 16, is \(14 + 2\). So, \(c = b + a\). Alternatively, 16 is also \(2 \times 8\), meaning \(c = 8 \times a\).

Let's check if this pattern (\(b = 7 \times a\) and \(c = b + a\) or \(c = 8 \times a\)) holds for the second set, (3, 21, 24):

  • First number \(a=3\).
  • Second number \(b=21\). Is \(b = 7 \times a\)? \(21 = 7 \times 3\). Yes, this holds.
  • Third number \(c=24\). Is \(c = b + a\)? \(24 = 21 + 3\). Yes, this holds. Is \(c = 8 \times a\)? \(24 = 8 \times 3\). Yes, this also holds.

The pattern seems consistent across the first two sets. Let's check the third set, (8, 56, 64):

  • First number \(a=8\).
  • Second number \(b=56\). Is \(b = 7 \times a\)? \(56 = 7 \times 8\). Yes, this holds.
  • Third number \(c=64\). Is \(c = b + a\)? \(64 = 56 + 8\). Yes, this holds. Is \(c = 8 \times a\)? \(64 = 8 \times 8\). Yes, this also holds.

The pattern (\(b = 7 \times a\) and \(c = b + a\) which implies \(c = 8 \times a\)) is observed in the first three sets.

Identifying the Set That Does Not Belong

Now, let's apply this pattern to the last set, (5, 35, 41), to see if it follows the same rule:

  • First number \(a=5\).
  • Second number \(b=35\). Is \(b = 7 \times a\)? \(35 = 7 \times 5\). Yes, this part holds.
  • Third number \(c=41\). Is \(c = b + a\)? \(41 = 35 + 5\)? \(35 + 5 = 40\). No, \(41 \neq 40\). Is \(c = 8 \times a\)? \(41 = 8 \times 5\)? \(8 \times 5 = 40\). No, \(41 \neq 40\).

The third number in the set (5, 35, 41) does not fit the pattern established by the other three sets. The third number should have been 40, but it is 41.

Therefore, the set (5, 35, 41) is the one that does not belong to the group.

Analysis of Number Sets
Set \((a, b, c)\) Check \(b = 7 \times a\) Check \(c = b + a\) Check \(c = 8 \times a\) Follows Pattern?
(2, 14, 16) \(14 = 7 \times 2\) (Yes) \(16 = 14 + 2\) (Yes) \(16 = 8 \times 2\) (Yes) Yes
(3, 21, 24) \(21 = 7 \times 3\) (Yes) \(24 = 21 + 3\) (Yes) \(24 = 8 \times 3\) (Yes) Yes
(8, 56, 64) \(56 = 7 \times 8\) (Yes) \(64 = 56 + 8\) (Yes) \(64 = 8 \times 8\) (Yes) Yes
(5, 35, 41) \(35 = 7 \times 5\) (Yes) \(41 = 35 + 5 = 40\) (No) \(41 = 8 \times 5 = 40\) (No) No

Conclusion on the Odd Set Out

Based on the pattern where the second number is 7 times the first, and the third number is the sum of the first two (or 8 times the first), the set (5, 35, 41) is the outlier because its third number does not follow this rule.

Revision Table: Number Series and Patterns

Key Concepts in Number Patterns
Concept Description Example
Arithmetic Progression A sequence where the difference between consecutive terms is constant. 2, 5, 8, 11,... (common difference is 3)
Geometric Progression A sequence where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio. 3, 6, 12, 24,... (common ratio is 2)
Mixed Operations Pattern A pattern that involves a combination of arithmetic operations (addition, subtraction, multiplication, division) between terms or based on term position. The pattern in this problem (\(b = 7a, c = b+a\)) is an example of a mixed operation pattern based on the first number.
Finding the Odd One Out Identifying the element in a group that does not share the common characteristic or pattern found in the other elements. This problem is an example of finding the odd set out based on a defined pattern.

Additional Information on Identifying Number Patterns

Identifying patterns in number sequences or sets is a common type of problem in logical reasoning. These patterns can be simple or complex and might involve various mathematical operations.

  • Basic Operations: Look for patterns based on addition, subtraction, multiplication, or division between consecutive numbers or numbers at specific positions.
  • Differences: Calculate the differences between consecutive terms. If the differences are constant, it's an arithmetic progression. If the differences of the differences are constant, it's a second-order pattern, and so on.
  • Ratios: Calculate the ratio between consecutive terms. If the ratio is constant, it's a geometric progression.
  • Position-Based Patterns: Sometimes the pattern relates the number to its position in the sequence (e.g., the nth term is \(2n + 1\)).
  • Combinations: Patterns can involve multiple operations or relationships between multiple terms, as seen in this problem where the second and third terms depend on the first.
  • Squaring, Cubing, etc.: Look for patterns involving squares, cubes, or other powers of numbers.
  • Prime Numbers, Fibonacci Series, etc.: Some patterns might be based on special types of numbers or well-known sequences.

To solve these problems, it's helpful to systematically test different possible relationships between the numbers in the given examples until a consistent rule is found. Once a rule is established, apply it to the remaining element(s) to find the one that does not fit.

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Similar Questions

  1. Select the set that does NOT belong in the following group of sets.

    (2, 14, 16), (6, 30, 36), (5, 35, 40), (3, 21, 24)
  2. Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number results in the second number. Similarly, certain mathematical operation(s) on the second number results in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.) 68 – 136 – 121 – 363; 29 – 58 – 43 – 129
  3. If 2 is added to each odd digit and 1 is subtracted from each even digit in the number 2741586, how many digits will appear more than once in the new number thus formed?
  4. Select the number that does NOT belong in the following group.

    71, 73, 77, 79

  5. Select the pair that does NOT belong in the following group.

    (√64,9), (√81,10), (√36,8), (√121,12)

  6. Select the number pair that does NOT belong in the following group.

    (1, 1), (4, 64), (8, 512), (9, 719)

  7. Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets?
    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - Operations on 13 such as adding to/subtracting from/multiplying with 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
    6 - 36 - 72 - 144 ; 7 - 49 - 98 - 196

  8. Two sets of numbers are given below. In each set of numbers, a certain mathematical operation on the first number results in the second number. Similarly, certain mathematical operation on the second number results in the third number and so on. Which of the given options follows the same set of operations as in the given sets?

    (NOTE - A two/three digit number cannot be broken into individual digits for operations e.g. if 37 is followed by 10, the operation cannot be 3+7 as a two digit number cannot be broken into individual digits)

    42 - 45 - 270 - 265
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    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding to/subtracting from/multiplying with 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

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  10. 16 is related to 260 following a certain logic. Following the same logic, 25 is related to 630. To which of the following is 9 related, following the same logic?

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Important Questions from Number Based

  1. In the following question, four number pairs are given. The number on left side of (-) is related to the number of the right side of (-) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

  2. Select the set in which the numbers are related in the same way as are the number of the following set.

    (3, 7, 58)

  3. Find the odd number/letters from the given alternatives.

  4. Find the odd number/letters from the given alternatives.

  5. Identify the number which is different from the other.

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