A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that all the four bulbs are defective?
Choose the most appropriate option:
A) 1/126  B) 1/129  C) 1/122  D) 1/124  E) 1/123
Out of nine, five are good and four are defective. Required probability   = ⁴C₄/⁹C₄   = 1/126   1/126nswer:1/126
<result>A</result>
A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that all the four bulbs are defective?