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Question

In each of the following questions, two numbers are given which follow a certain logical or arithmetic relationship. Identify the same pattern and apply it to find the missing number in the second pair. Choose the correct option from the given alternatives.
\(25:30:: 36:?\)

This question was previously asked in
SSC Stenographer 2025 Question Paper (06-Aug-2025) Shift 2
The correct answer is
42

Number Relationship Pattern Explained

The question presents a number analogy problem. We are given a pair of numbers (\(25:30\)) that follow a specific logical or arithmetic relationship. Our task is to identify this pattern and apply it to find the missing number in the second pair (\(36:?\)).

Analyzing the First Pair (\(25:30\))

Let's examine the relationship between the first number, \(25\), and the second number, \(30\). We observe that \(25\) is a perfect square: \(25 = 5^2\) Now, let's see how \(30\) relates to \(25\). The difference is \(30 - 25 = 5\). Interestingly, this difference, \(5\), is the square root of the first number, \(25\). \( \sqrt{25} = 5 \) So, the relationship appears to be: The second number is obtained by adding the square root of the first number to the first number itself. \( \text{Second Number} = \text{First Number} + \sqrt{\text{First Number}} \) Let's verify this for the first pair: \( 30 = 25 + \sqrt{25} \) \( 30 = 25 + 5 \) \( 30 = 30 \) The pattern holds true for the first pair.

Applying the Pattern to the Second Pair (\(36:?\))

Now, we apply the same identified pattern to the second pair, where the first number is \(36\). Using the formula: \( \text{Missing Number} = 36 + \sqrt{36} \) First, find the square root of \(36\): \( \sqrt{36} = 6 \) Now, add this result to \(36\): \( \text{Missing Number} = 36 + 6 \) \( \text{Missing Number} = 42 \)

Therefore, the missing number in the second pair is \(42\). Comparing this with the given options, we find that option 2 matches our result.

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Important Questions from Number Based

  1. In the following question, four number pairs are given. The number on left side of (-) is related to the number of the right side of (-) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

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