Multiple Choice Questions on The sum of all possible products taken two at a time out of the numbers 1 2 3 4 is ........ for CDS Exam Preparation

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Multiple Choice Questions

The sum of all possible products taken two at a time out of the numbers 1 2 3 4 is ........

Quantitative Aptitude (CDS) Simplification
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    The sum of all possible products taken two at a time out of the numbers \pm1,\pm 2,\pm 3,\pm 4 is

    0

    Correct Answer

    -30

    Incorrect Answer

    30

    Incorrect Answer

    55

    Incorrect Answer
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    Explanation:

    Let us multiply first two numbers \pm1  and  \pm 2
    1 x 2 = 2, 1 x-2 = -2, -1 x 2 = -2, -1 x -2 = 2
    Adding above 4, we get sum as 0.
    The same is valid for all the possible combination.
    Hence, total sum will be zero.

    By: Munesh Kumari
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