A box contains seven 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 answer:	A) 2/35	B) 3/35	C) 1/35	D) 3/37	E) None of these
Out of nine light , five are good and four are defective.   Required probability = 31/353/71/353 = 1/35   1/35
<result>C</result>
A box contains seven light out of which 3 are defective. If three light are chosen at random, find the probability that all the three light are defective?