यदि $\binom{40}{0} + \binom{41}{1} + \binom{42}{2} + \dots + \binom{60}{20} = \frac{m}{n} \binom{60}{20}$,जहाँ $m$ और $n$ सह-अभाज्य हैं,तो $m+n$ का मान ज्ञात कीजिए।

  • A
    $102$
  • B
    $103$
  • C
    $104$
  • D
    $105$

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