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Odd number triad: one number = a fixed multiple of the sum or difference of the other two

This type of question, asked 3 times: 12 Sep 2024 S1, 12 Sep 2024 S2, 23 Sep 2024 S1. All 3 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    12 Sep 2024 S1

    3
    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 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

    12 Sep 2024 S2

    12
    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 its 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.)

    Tap an option to check your answer.

  3. Question 3

    23 Sep 2024 S1

    6
    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 its 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.)

    Tap an option to check your answer.