MCQ
${ }^{61} C _{57}-{ }^{60} C _{56}$ is equal to :
  • A
    ${ }^{61} C _{58}$
  • ${ }^{60} C _{57}$
  • C
    ${ }^{60} C _{58}$
  • D
    ${ }^{60} C _{56}$

Answer

Correct option: B.
${ }^{60} C _{57}$
(B)

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