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21 is related to 83 following a certain logic. Following the same logic, 33 is related to 131. To which of the given options is 43 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 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.)

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
171

Logic Identification

The question presents a relationship between pairs of numbers and asks to identify the rule governing this relationship. We are given:

  • 21 is related to 83
  • 33 is related to 131

The constraint is that operations must be performed on the whole numbers, not their digits.

Applying Logic to Examples

Let's test potential mathematical operations. Consider the first pair (21 -> 83):

  • Multiplying 21 by 4 gives 84.
  • Subtracting 1 from 84 yields 83.
  • So, the potential logic is: \( \text{Result} = (\text{Number} \times 4) - 1 \)

Let's verify this logic with the second pair (33 -> 131):

  • Using the formula: \( (33 \times 4) - 1 \)
  • \( 33 \times 4 = 132 \)
  • \( 132 - 1 = 131 \)

The logic \( (\text{Number} \times 4) - 1 \) holds true for both given examples.

Calculating the Related Number for 43

Now, we apply the identified logic to the number 43:

  • Number = 43
  • Applying the formula: \( (43 \times 4) - 1 \)
  • Calculate the product: \( 43 \times 4 = 172 \)
  • Subtract 1: \( 172 - 1 = 171 \)

Therefore, 43 is related to 171 following the established logic.

Option Verification

Comparing the calculated result (171) with the given options:

  • Option 1: 177
  • Option 2: 171
  • Option 3: 161
  • Option 4: 166

The calculated value 171 matches Option 2.

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