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Question

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)
14 - 84 - 86 - 82
15 - 90 - 92 - 88

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
8 - 48 - 50 - 46

Analyze Given Number Sets

The question asks to find the pattern governing the number sequences and identify which option follows the same pattern. The constraint is that two or three-digit numbers cannot be split into digits.

Set 1 Pattern Identification (14 - 84 - 86 - 82)

  • 14 to 84: The operation is multiplication. \(14 \times 6 = 84\).
  • 84 to 86: The operation is addition. \(84 + 2 = 86\).
  • 86 to 82: The operation is subtraction. \(86 - 4 = 82\).

The pattern observed is: Multiply by 6, Add 2, Subtract 4.

Set 2 Pattern Confirmation (15 - 90 - 92 - 88)

  • 15 to 90: \(15 \times 6 = 90\). Matches the first step.
  • 90 to 92: \(90 + 2 = 92\). Matches the second step.
  • 92 to 88: \(92 - 4 = 88\). Matches the third step.

The pattern (\(\times 6\), \(+ 2\), \(- 4\)) is consistent across both given sets.

Evaluate Options Using the Pattern

We will now test each option against the identified pattern (\(\times 6\), \(+ 2\), \(- 4\)).

Option 1 Check (34 - 70 - 79 - 78)

The first step requires \(34 \times 6\). \(34 \times 6 = 204\), which is not 70. This option does not follow the pattern.

Option 2 Check (22 - 90 - 100 - 99)

The first step requires \(22 \times 6\). \(22 \times 6 = 132\), which is not 90. This option does not follow the pattern.

Option 3 Check (37 - 298 - 299 - 287)

The first step requires \(37 \times 6\). \(37 \times 6 = 222\), which is not 298. This option does not follow the pattern.

Option 4 Check (8 - 48 - 50 - 46)

  • 8 to 48: \(8 \times 6 = 48\). Matches the pattern.
  • 48 to 50: \(48 + 2 = 50\). Matches the pattern.
  • 50 to 46: \(50 - 4 = 46\). Matches the pattern.

This option successfully follows the sequence operations: \(\times 6\), \(+ 2\), \(- 4\).

Conclusion on Number Sequence Operations

Option 4 is the only sequence that adheres to the mathematical operations identified from the given sets.

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Similar Questions

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    175 221 267 313 359 ?

  2. In the following number pairs, the second number is obtained by applying certain mathematical operations to the first number. Which numbers should replace X and Y so that the pattern followed by the two numbers on the left side of :: is the same as that on the right side of ::?

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Important Questions from Number Series

  1. What will come in place of question mark (?) in the following number series?

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  5. A series is given with one term wrong. Select that wrong term from the given alternatives.

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