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Odd number pair: second = first minus a fixed number

This type of question, asked 3 times: 14 Jul 2023 S3, 27 Jul 2023 S1, 9 Sep 2024 S1. All 3 questions below, oldest first.

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  1. Question 1

    14 Jul 2023 S3

    15
    The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number-pairs, except one. Find that odd number-pair. (NOTE: The relation should be found without breaking down the numbers into its constituent digits)

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  2. Question 2

    27 Jul 2023 S1

    14
    The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number-pairs, except one. Find that odd number-pair.

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  3. Question 3

    9 Sep 2024 S1

    4
    In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. In three of the four pairs, the same pattern is applied and hence they form a group. Select the number-pair that DOES NOT belong to this 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 to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

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