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Q)

# To find out degree of freedom, the correct expression is :

( A ) $f=\frac{\gamma+1}{2}$
( B ) $f=\frac{2}{\gamma-1}$
( C ) $f=\frac{2}{\gamma+1}$
( D ) $f=\frac{1}{\gamma+1}$

$r=1+\large\frac{2}{f}$
$\large\frac{2}{f}$$=r+1$
=> $f=\large\frac{2}{r-1}$