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Odd number triad: third = product of the first two plus or minus a fixed number

This type of question, asked 3 times: 10 Sep 2024 S1, 13 Sep 2024 S1, 18 Sep 2024 S1. All 3 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    10 Sep 2024 S1

    10
    Three of the following four options are alike in a certain way and thus form a group. Which is the option 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 /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.

  2. Question 2

    13 Sep 2024 S1

    16
    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

    18 Sep 2024 S1

    22
    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.