A box contains four light out of which 2 are defective. If two light are chosen at random, find the probability that all the two light are defective? Answers:
A) 2/7
B) 3/8
C) 1/9
D) 3/7
E) 1/6
Out of nine light , five are good and four are defective.   Required probability = 2C2/4C2 = 1/6   1/6
<result>E</result>
A box contains four light out of which 2 are defective. If two light are chosen at random, find the probability that all the two light are defective?