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

  • question_answer
    \[\left( 3\times 5\times 7 \right)+7\]is a

    A) Prime number

    B) Composite number

    C) Can't say

    D) None of these

    Correct Answer: B

    Solution :

    We have, \[\left( 3\times 5\times 7 \right)+7=105+7=112\] \[\therefore \] Prime factors of \[112=2\times 2\times 2\times 2\times 7\] \[={{2}^{4}}\times 7\] So, it is the product of prime factors 2 and 7. i.e. it has factors other than 1 and itself. Hence, it is a composite number.


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