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Sum of all products taken two at a time of the numbers +-1, +-2, ..., +-n

The same question, asked 2 times: CDS 2 2018*, CDS 2 2020. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    CDS 2 2018

    23
    The sum of all possible products taken two at a time out of the numbers ±1,±2,±3,±4\pm 1, \pm 2, \pm 3, \pm 4 is

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  2. Question 2

    CDS 2 2020

    14
    The sum of all possible products taken two at a time out of the numbers ±1,±2,±3,±4,±5\pm 1, \pm 2, \pm 3, \pm 4, \pm 5 is

    Tap an option to check your answer.