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Question

Identify the odd pair:

This question was previously asked in
SSC Stenographer 2025 Question Paper (06-Aug-2025) Shift 2
The correct answer is
24-28

Identifying the Odd Pair in Number Sets

The question asks us to find the pair of numbers that is different from the others based on some underlying pattern or property. We need to examine each pair and look for a common characteristic shared by most pairs, but not by one.

Analyzing the Number Pairs

Let's look at the pairs provided:

  • Pair 1: 13-17
  • Pair 2: 24-28
  • Pair 3: 19-23
  • Pair 4: 29-31

Step-by-Step Pattern Identification

We can analyze the properties of the numbers within each pair:

  1. Pair 1 (13-17):
    • 13 is a prime number.
    • 17 is a prime number.
    • Both numbers in the pair are prime.
  2. Pair 2 (24-28):
    • 24 is a composite number (divisible by 1, 2, 3, 4, 6, 8, 12, 24).
    • 28 is a composite number (divisible by 1, 2, 4, 7, 14, 28).
    • Both numbers in the pair are composite.
  3. Pair 3 (19-23):
    • 19 is a prime number.
    • 23 is a prime number.
    • Both numbers in the pair are prime.
  4. Pair 4 (29-31):
    • 29 is a prime number.
    • 31 is a prime number.
    • Both numbers in the pair are prime.

Determining the Odd Pair

By examining the primality of the numbers:

  • Pairs 1, 3, and 4 consist of two prime numbers each.
  • Pair 2 consists of two composite numbers.

Therefore, the pair (24-28) is the odd one out because it is the only pair where both numbers are composite, while the other pairs consist solely of prime numbers.

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Important Questions from Classification

  1. Three of the following four are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?
    (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster.)

  2. Three of the following numbers are alike in a certain way and one is different. Pick the odd one out.

    (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/deleting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

  3. The following contains two pairs of words which are related to each other in a certain way. Three of the following four word-pairs are alike as these have the same relationship and thus form a group. Which word-pair does NOT belong to that group?
    (The words must be considered as meaningful English words and must not be grouped based on the number of letters/number of consonants/vowels in the word)

  4. Three of the following four options are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?

    (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 etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

  5. The following contains two pairs of words which are related to each other in a certain way. Three of the following four word-pairs are alike as these have the same relationship and thus form a group. Which word-pair does NOT belong to that group?
    (The words must be considered as meaningful English words and must not be grouped based on the number of letters/number of consonants/vowels in the word)

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