यदि ${\cot ^{ - 1}}\frac{n}{\pi } > \frac{\pi }{6},\,\,n \in N$ है,तो $n$ का अधिकतम मान क्या है?

  • A
    $6$
  • B
    $7$
  • C
    $5$
  • D
    इनमें से कोई नहीं

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