Multiple Choice Questions on If 3x ndash 3x ndash 1 18 then the value of xx is ........ for CDS Exam Preparation

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Multiple Choice Questions

If 3x ndash 3x ndash 1 18 then the value of xx is ........

Quantitative Aptitude (CDS) Algebra
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    If 3x – 3x – 1 = 18, then the value of xx is:

    3

    Incorrect Answer

    8

    Incorrect Answer

    27

    Correct Answer

    216

    Incorrect Answer
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    Explanation:

    From the given expression :
    3x − 3x − 1 = 18 
    ⇔ 3x −1 (3 − 1) = 18 
    ⇔  3x −1 = 9 = 32
    From the equation power :
    ⇔  x − 1 = 2 ⇔ x = 3.
    ∴ xx = 33 = 27

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