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    Question

    log (402- 202) is equal

    to
    A log 3 Correct Answer Incorrect Answer
    B log 60 + log 20 Correct Answer Incorrect Answer
    C log 40 – log 20 Correct Answer Incorrect Answer
    D log 20 Correct Answer Incorrect Answer

    Solution

    Considering the given equation log (402 - 202) β‡’ (402 - 202) = (40 + 20) (40 - 20) β‡’ (402 - 202) = 60 Γ— 20 Now, log (402 - 202) = log (60 Γ— 20) β‡’ log (60 Γ— 20) = log 60 + log 20 ∴ Required value is log 60 + log 20

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