यदि $\binom{2n}{3} : \binom{n}{2} = 44 : 3$ और $\binom{n}{r} = 15$ है,तो $r = \dots$

  • A
    $3$
  • B
    $4$
  • C
    $5$
  • D
    $6$

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$^{47}C_4 + \sum_{r=1}^5 {}^{52-r}C_3 = $

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यदि $^8C_r = ^8C_{r+2}$ है,तो $^rC_2$ का मान क्या है?

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