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Question

Below are given two sets of numbers. 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)

13 - 26 - 30 - 60 ; 9 - 18 - 22 - 44

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
6 - 12 - 16 - 32

Pattern Identification

The problem presents two number sequences where a specific mathematical operation connects consecutive numbers. We need to identify this pattern.

Set 1: 13 - 26 - 30 - 60

  • The operation from 13 to 26 is multiplication by 2: \(13 \times 2 = 26\).
  • The operation from 26 to 30 is addition of 4: \(26 + 4 = 30\).
  • The operation from 30 to 60 is multiplication by 2: \(30 \times 2 = 60\).

The pattern identified is \(\times 2\), \(+ 4\), \(\times 2\).

Set 2: 9 - 18 - 22 - 44

  • \(9 \times 2 = 18\) (Matches \(\times 2\))
  • \(18 + 4 = 22\) (Matches \(+ 4\))
  • \(22 \times 2 = 44\) (Matches \(\times 2\))

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

Option Analysis

We will now check which option follows the identified pattern (\(\times 2\), \(+ 4\), \(\times 2\)):

Option 1: 10 - 20 - 24 - 54

  • \(10 \times 2 = 20\)
  • \(20 + 4 = 24\)
  • \(24 \times 2 = 48\). This is not 54. Option 1 is incorrect.

Option 2: 2 - 4 - 8 - 12

  • \(2 \times 2 = 4\)
  • \(4 + 4 = 8\)
  • \(8 \times 2 = 16\). This is not 12. Option 2 is incorrect.

Option 3: 3 - 6 - 10 - 22

  • \(3 \times 2 = 6\)
  • \(6 + 4 = 10\)
  • \(10 \times 2 = 20\). This is not 22. Option 3 is incorrect.

Option 4: 6 - 12 - 16 - 32

  • \(6 \times 2 = 12\)
  • \(12 + 4 = 16\)
  • \(16 \times 2 = 32\). This matches the pattern. Option 4 is correct.

Final Answer Determination

Option 4 (6 - 12 - 16 - 32) is the only sequence that follows the mathematical operations \(\times 2\), \(+ 4\), \(\times 2\) derived from the given sets.

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