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

  • question_answer
    If LCM of 12 and 42 is 10m + 4, the value of m is equal to

    A) 7

    B) 8

    C) 6

    D) 9

    Correct Answer: B

    Solution :

    Factors of 12 and 42 are
                            \[12=2\times 2\times 3\]
                            \[42\text{ }=\text{ }2\times \text{3}\times 7\]
     Hence, \[\left( 12,\,\,42 \right)=2\times 2\times 3\times 7=84\]
     And                 \[84=10\times 8+4\]
     Therefore,         m = 8
     


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