A box contains six bulbs out of which 3 are defective. If three bulbs are chosen at random, find the probability that all the three bulbs are defective?
Select the correct option:
A) 1/12
B) 1/20
C) 1/29
D) 1/36
E) 1/26
Out of six, three are good and three are defective. Required probability   = 3C3/6C3   = 1/20   Answer:1/20
<result>B</result>
A box contains six bulbs out of which 3 are defective. If three bulbs are chosen at random, find the probability that all the three bulbs are defective?