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KVPY Sample Paper KVPY Stream-SX Model Paper-24

  • question_answer
    The number of values of 'r' satisfying the equation- \[^{39}{{C}_{3r}}-1-{{\,}^{39}}{{C}_{{{r}^{2}}}}={{\,}^{39}}{{C}_{{{r}^{2}}-1}}-{{\,}^{39}}{{C}_{3r}}\] is

    A) 1

    B) 2

    C) 3

    D) 4

    Correct Answer: B

    Solution :

    r=3 or 5; r=0 is not possible


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