A man kept 6 black, 5 brown and 7 purple shirts in a drawer. What is the probability of his picking a purple shirt with his eyes closed?

A.
(frac{1}{7}) 
B.
(frac{11}{18}) 
C.
(frac{7}{18}) 
D.
(frac{7}{11})
Correct Answer: Option C
Explanation
Prob. of purple shirt is (frac{7}{18})