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12th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-10

  • question_answer
    If \[a=\frac{1}{\sqrt{10}}(3\hat{i}+\hat{k})\] and \[b=\frac{1}{7}(2\hat{i}+3\hat{j}-6\hat{k}),\] then the value of\[(2a-b)\].\[\{(a\times b)\times (a+2b)\}\]is ______.

    A)  \[-3\]                           

    B)  3

    C)  \[-5\]   

    D)  5

    E)  None of these

    Correct Answer: C

    Solution :

    Not Available                


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