- 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.
(A) 62/63
(B) 125/126
(C) 1/63
(D) 1/42
(E) 1/126
(A) 62/63
(B) 125/126
(C) 1/63
(D) 1/42
(E) 1/126