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5th Class Mathematics Factors and Multiples Question Bank Factor & Multiple

  • question_answer
    Let a, b, c.................be factors of numbers 28. The value of \[\frac{1}{a}+\frac{1}{b}+\frac{1}{c}+.........\]is equal to

    A) \[\frac{13}{7}\]                         

    B) \[\frac{14}{7}\]

    C) \[a\frac{27}{13}\]                                 

    D)  None of these

    Correct Answer: D

    Solution :

     
    2 28
    2 14
    7 7
    1
    Factors= 1, 2, 7, 4, 14, 28 \[1+\frac{1}{2}+\frac{1}{4}+\frac{1}{7}+\frac{1}{14}+\frac{1}{28}\]\[=\frac{28+14+7+4+2+1}{28}=\frac{56}{28}=2\]


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