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Question

41 is related to 165 following a certain logic. Following the same logic, 18 is related to 73. To which of the given options is 122 related, following the same logic?

(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.)

This question was previously asked in
RRB ALP 2025 CBT 2 Mechanic Motor Vehicle Question Paper (28-Jul-2026) (Shift 1)
The correct answer is
489

Number Relationship Logic Explained

The question presents a numerical relationship problem. We need to find the underlying logic connecting the first pair of numbers (41 and 165) and the second pair (18 and 73), and then apply this logic to find the number related to 122.

Identifying the Pattern

Let's analyze the first pair: 41 and 165.

  • Consider multiplying 41 by a number close to 4: \(41 \times 4 = 164\).
  • Adding 1 to the result gives 165: \(164 + 1 = 165\).
  • So, the potential logic is: Multiply the first number by 4 and add 1.

Let's verify this logic with the second pair: 18 and 73.

  • Apply the same logic: \(18 \times 4 + 1\).
  • Calculate: \(18 \times 4 = 72\).
  • Add 1: \(72 + 1 = 73\).
  • The logic holds true for the second pair as well.

Applying the Logic to Find the Missing Number

Now, we apply the confirmed logic (Multiply by 4, add 1) to the number 122.

  • Number: 122.
  • Operation: \((122 \times 4) + 1\).
  • Calculation:
    • \(122 \times 4 = 488\).
    • \(488 + 1 = 489\).
  • Therefore, 122 is related to 489.

Conclusion

Following the established pattern of multiplying by 4 and adding 1, the number related to 122 is 489. This corresponds to Option A.

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