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Odd number pair: second = (n plus or minus k) squared

This type of question, asked 2 times: 12 Sep 2024 S3, 26 Sep 2024 S3. All 2 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    12 Sep 2024 S3

    16
    Three of the following number-pairs are alike in some manner and hence form a group. Which number-pair does not belong to that group? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its 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.)

    Tap an option to check your answer.

  2. Question 2

    26 Sep 2024 S3

    20
    Three of the following number-pairs are alike in some manner and hence form a group. Which number-pair does not belong to that group? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its 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.)

    Tap an option to check your answer.