If 1 is subtracted from each odd digit and 1 is added to each even digit in the number 843675432925 what will be the sum of the digits which are third from the left and second from the right in the new number thus formed?

1. A

   3

2. B

   4

3. C

   2

4. D

   5

Appeared in: RRB Nsg. Superintendent-2026 (Shift -1st)

Explanation

• The initial number is 843675432925.
• The rule is to add 1 to even digits and subtract 1 from odd digits.
• Applying this rule transforms the number to 952764523834.
• The third digit from the left in the new number is 2.
• The second digit from the right in the new number is 3.
• The sum of these two digits is 2 + 3 = 5.

Why Other Options Were Wrong

• Option A: This is the value of the second digit from the right (3) alone, not the sum of the two specified digits.
• Option B: This is the value of the last digit (first from the right) in the new number, which is 4. It is not the sum of the requested digits.
• Option C: This is the value of the third digit from the left (2) alone, not the sum of the two specified digits.

Related Visual

• Visual 1: Flowchart: A visual flowchart can illustrate the process: 1. Start with the number 843675432925. 2. Iterate through each digit. 3. Apply the condition: Is the digit even or odd? 4. Perform the operation (+1 for even, -1 for odd). 5. Construct the new number. 6. Identify the 3rd digit from the left and 2nd from the right. 7. Sum the two identified digits to get the final answer.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Digit manipulation and positional value identification in a number series as background academic context rather than a clinical decision trigger.
• While this is a general aptitude question, the underlying skills are crucial in nursing.
• Attention to detail and the ability to follow a multi-step procedure without error are fundamental for safe medication administration, calculating dosages, and accurate patient charting.
• Mistakes in following a sequence, similar to the steps in this problem, can lead to significant clinical errors.

How to Approach the Question

• First, carefully read the question to understand the rules for modifying the number and what final calculation is required.
• Write down the original number: 843675432925.
• Go through the number digit by digit, applying the rule: add 1 to even digits and subtract 1 from odd digits.
• Write down the new number as you calculate it to avoid errors: 952764523834.
• Identify the positions requested: 'third from the left' (2) and 'second from the right' (3).
• Perform the final operation, which is to find the sum of these two digits: 2 + 3 = 5.

Concept Tested & Keywords

• Concept Tested: Digit manipulation and positional value identification in a number series.
• Stem keywords: subtract, odd digit, add, even digit, sum, third from the left, second from the right
• Lead-in keywords: what will be

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QAhqSvJbs9wUofAZvuxG85

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