JEE Main & Advanced Sample Paper JEE Main - Mock Test - 10

  • question_answer
    Let \[I=\int_{-2}^{2}{(x-[x])\,dx\,,}\] where [x] represents the greatest integer in x not greater than x. Then the value of I is

    A)  4                    

    B) 3    

    C) 2                     

    D) 1

    Correct Answer: C

    Solution :

    [c] :\[I=\int\limits_{-2}^{2}{(x-[x])dx}=\int\limits_{-2}^{-1}{(x+2)dx}+\int\limits_{-1}^{0}{(x+1)}dx\] \[+\int\limits_{0}^{1}{x\,dx}+\int\limits_{1}^{2}{(x-1)\,}dx\] \[=\left[ \frac{{{x}^{2}}}{2}+2x \right]_{-2}^{-1}+\left[ \frac{{{x}^{2}}}{2}+x \right]_{-1}^{0}+\left[ \frac{{{x}^{2}}}{2} \right]_{0}^{1}+\left[ \frac{{{x}^{2}}}{2}-x \right]_{1}^{2}\] \[=\frac{1}{2}-2-(2-4)+0-\left( \frac{1}{2}-1 \right)+\frac{1}{2}+2-2-\left( \frac{1}{2}-1 \right)\]\[=2\]


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