A box contains six light out of which 3 are defective. If three light are chosen at random, find the probability that all the three light are defective?  Choose the correct choice:
A) 2/25
B) 3/20
C) 1/30
D) 3/35
E) None of these
Out of nine light , five are good and four are defective.   Required probability = 3C3/6C3 = 1/20   3/20
<result>B</result>
A box contains six light out of which 3 are defective. If three light are chosen at random, find the probability that all the three light are defective?