Find the probability that a number selected at random from 40 to 50 is a prime

A.
(frac{3}{11}) 
B.
(frac{5}{11}) 
C.
(frac{3}{11}) 
D.
(frac{4}{11})
Correct Answer: Option C
Explanation
From 40 to 50 = 11 & number are prime i.e. 41, 43, 47
prob. of selecting a prime No. is (frac{3}{11})