SSC Quantitative Aptitude LCM & HCF Question Bank LCM and HCF (I)

  • question_answer
    Find the LCM of \[({{2}^{3}}\times 3\times {{5}^{2}}\times 7),\] \[({{2}^{4}}\times {{3}^{2}}\times 5\times {{7}^{2}}\times 11)\] and \[(2\times 33\times 54).\]

    A) \[{{2}^{4}}\times {{3}^{3}}\times {{5}^{4}}\]

    B) \[2\times 3\times 7\times 5\times 11\]

    C) \[{{2}^{4}}\times {{3}^{3}}\times {{5}^{4}}\times {{7}^{2}}\times 11\]

    D) \[{{2}^{4}}\times {{3}^{4}}\times {{5}^{4}}\times 7\]

    Correct Answer: C

    Solution :

    [c] Given prime factors, \[({{2}^{3}}\times 3\times {{5}^{2}}\times 7);\] \[({{\underline{2}}^{4}}\times {{3}^{2}}\times 5\times {{\underline{7}}^{2}}\times 11);\,\,(2\times {{\underline{3}}^{3}}\times {{\underset{\scriptscriptstyle-}{5}}^{4}})\] \[\therefore \] Required LCM = Product of prime factors having highest powers \[={{2}^{4}}\times {{3}^{3}}\times {{5}^{4}}\times {{7}^{2}}\times 11\]


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