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11th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-12

  • question_answer
    \[\sum\limits_{r=0}^{n}{{{(-1)}^{r}}}\frac{{}^{n}{{c}_{r}}}{{}^{r+3}{{c}_{r}}}\] is equal to ________.

    A)  \[\frac{3!}{2\,(n+3)}\]  

    B)  \[\frac{3!}{2\,(n-3)}\]

    C)  \[\frac{3!}{(n+3)}\]                  

    D)  \[\frac{3!}{(n-3)}\]

    E)  None of these

    Correct Answer: A

    Solution :

     Not Available   


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