MCQ
${ }^{47} C _4+\sum_{r=1}^5{ }^{52-r} C _3$ is equal to :
  • A
    ${ }^{51} C _4$
  • ${ }^{52} C _4$
  • C
    ${ }^{53} C _4$
  • D
    None of these

Answer

Correct option: B.
${ }^{52} C _4$
(B)

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