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KVPY Sample Paper KVPY Stream-SX Model Paper-10

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

    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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