The probability of a man hitting a target is $\frac{1}{4}$. If he fires 7 times, the probability of hitting the target at least twice is :

Question

( A ) $1 - \frac{5}{2} (\frac{3}{4})^{^6}$
( B ) $1 - (\frac{3}{9})^{^6}$
( C ) $1 - 5. \frac{3^5}{6}$
( D ) $1 - \frac{15}{2} (\frac{3}{4})^{^6}$