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    Subject

    Quantitative Aptitude

    Topic

    Power & Logarithm

    Which of the following statements is not correct?

    ক)
    log10 10 = 1
    খ)
    log (2 + 3) = log (2 x 3)
    গ)
    log10 1 = 0
    ঘ)
    log (1 + 2 + 3) = log 1 + log 2 + log 3

    Explanation

    (a) Since loga a = 1, so log10 10 = 1. (b) log (2 + 3) = log 5 and log (2 x 3) = log 6 = log 2 + log 3 So, log (2 + 3) ≠ log (2 x 3) (c) Since loga 1 = 0, so log10 1 = 0. (d) log (1 + 2 + 3) = log 6 = log (1 x 2 x 3) = log 1 + log 2 + log 3. So, (b) is incorrect.

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