Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-12

  • question_answer
    \[\log m+\log n\]is equal to

    A)  \[\log \left( \frac{m}{n} \right)\]  

    B)  \[\log (m\times n)\]

    C)  \[log{{(m)}^{2}}\]      

    D)  \[\log ({{n}^{m}})\]

    Correct Answer: B

    Solution :

    \[{{\log }_{e}}m=a\]and \[{{\log }_{e}}n=b\] \[\because \] \[m={{e}^{e}}\]and \[n={{e}^{b}}\] \[\because \] \[(m\times n)={{e}^{a}}\times {{e}^{b}}={{e}^{a+b}}\] \[\Rightarrow \]   \[a+b={{\log }_{e}}(m\times n)\] \[\therefore \]\[{{\log }_{e}}m+{{\log }_{e}}n={{\log }_{e}}(m\times n)\]


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