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

  • question_answer
    Column-I denotes the number and Column-II denotes the prime factors of the numbers given in Column-I- Match them correctly.
      Column - I   Column - II
    P. 945 1. \[2\times 5\times {{11}^{2}}\times 17\]
    Q. 20570 2. \[{{7}^{2}}\times 13\times 17\times 19\]
    R. 205751 3. \[{{3}^{3}}\times 5\times 7\]

    A) P-3,      Q-1,     R-2

    B) P-1,      Q-3,     R-2

    C) P-2,      Q-1,     R-3

    D) P-1,      Q-2,     R-3

    Correct Answer: A

    Solution :

    3 945
    3 315
    3 105
    5 35
    7 7
      1
    Prime factors of \[945={{3}^{3}}\times 5\times 7\]
    2 20570
    5 10285
    11 2057
    11 187
    17 17
      1
    Prime factors of \[20570=2\times 5\times {{11}^{2}}\times 17\]
    7 20570
    7 29393
    13 4199
    17 323
    19 19
      19
      1
    Prime factors of \[205751={{7}^{2}}\times 13\times 17\times 19\]


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