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8th Class Mathematics Factorisation Question Bank Factors & Multiples

  • question_answer
    The LCM of two prime numbers \[x\] and \[y\]\[(x>y)\] is 161. The value of \[3y-x\] is

    A) \[-2\]                           

    B)  \[-1\]

    C) \[1\]                            

    D)  \[2\]

    Correct Answer: A

    Solution :

    LCM of two prime numbers \[x\]and\[y=161\] \[\because \]HCF of \[x\]and\[y=1\] LCM\[=x\times y=161\] Factorizing, we get \[x\times y=161=7\times 23\] \[\therefore \]\[x=23,\,\,y=7\] \[3y-x=3\times 7-23=-2\]


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