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JEE Main & Advanced Mathematics Determinants & Matrices Question Bank Self Evaluation Test - Matrices

  • question_answer
    If number of elements is 20 then how many different types of matrices can be formed if number of rows is always even?

    A) 3

    B) 4

    C) 5

    D) 6

    Correct Answer: B

    Solution :

    [b] \[\because \,20=1\times 20=2\times 10=4\times 5=5\times 4\] \[=10\times 2=20\times 1\] Out of this number of rows is even so possible cases are \[2\times 10,\,\,4\times 5,\,\,10\times 2\] and \[20\times 1\]. So number of matrices are 4.


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