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10th Class Mathematics Real Numbers Question Bank Case Based (MCQs) - Real Numbers

  • question_answer
    Find the LCM between two green lights.

    A) 720

    B) 730      

    C) 710

    D) 740      

    Correct Answer: A

    Solution :

    Sol.     To find the LCM, we list all prime factors of 90 and 144 and their greatest exponents as follows:
    Prime factors of 90 and 144 Greatest exponents
    2 4
    3 2
    5 1
    \[\therefore \,\,\,\,\,\,\,\,\,\,\,LCM={{2}^{4}}\times {{3}^{2}}\times {{5}^{1}}\]
                            \[=16\times 9\times 5=720\]
    So, option [a] is correct.


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