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10th Class Mathematics Real Numbers Question Bank MCQs - Real Numbers

  • question_answer
    If the LCM of o and 18 is 36 and HCF of a and 18 is 2, then a is equal to:

    A) 2

    B) 3

    C) 4

    D) 1

    Correct Answer: C

    Solution :

    Sol.      [c] LCM \[LCM\,\,(a,18)=36\]
    and \[HCF\,\,(a,18)=2\]
                \[a\times 18=LCM(a,18)\times HCF(a,18)\]
    \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,a\times 18=36\times 2\]
    \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,a=4\]


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