Find the missing number that should replace the question mark.-

Appeared in: Haryana CHO - 2022

Explanation

The question requires identifying the logical pattern in a grid of numbers to find the missing value.
The pattern is consistent across each row: each number is obtained by adding 2 to the previous number in that row.
In the first row, 9 + 2 = 11, and 11 + 2 = 13.
In the second row, 13 + 2 = 15, and 15 + 2 = 17.
Applying this rule to the third row, which starts with 10 and 12, the next number must be 12 + 2 = 14.

Option A: 12 is incorrect because it is already the second number in the third row. The pattern requires adding 2 to 12, not repeating it.
Option B: 13 is incorrect. This would imply adding 1 to 12, which breaks the consistent 'add 2' pattern observed in the other rows.
Option D: 15 is incorrect. This would mean adding 3 to 12, which does not follow the 'add 2' rule established by the first two rows.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Logical Reasoning: Number Series Pattern Recognition as background academic context rather than a clinical decision trigger.
While this is a general aptitude question, logical reasoning is a critical skill for nurses.
Nurses use pattern recognition daily to interpret vital signs, lab results, and patient symptoms to identify trends and potential health problems.
Accurate calculation skills are fundamental for safe medication administration, including calculating dosages, drip rates, and fluid balances.

How to Approach the Question

First, carefully examine the arrangement of numbers in the grid. Look for relationships horizontally (rows), vertically (columns), or diagonally.
Start by testing a simple hypothesis. Check for a consistent arithmetic operation (addition, subtraction, etc.) across the first row: 9, 11, 13. You see a clear pattern of adding 2.
Verify if this pattern holds true for the second row: 13, 15, 17. Yes, 13 + 2 = 15, and 15 + 2 = 17. The pattern is confirmed.
Apply the confirmed pattern to the third row to find the missing number. The row is 10, 12, ?. Calculate 12 + 2.
The result is 14. Match this result with the given options.
Select the option that corresponds to your calculated answer.

Concept Tested & Keywords

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Practise the full Haryana CHO - 2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.