A consignment of 15 record players contains 4 defectives. The record players are selected at random, one by one, and examined. The one is examined, are not put back. Then the probability that 9th one examined is the last defective, is

A consignment of 15 record players contain 4 defectives. The record players are selected at random, one by one and examined. The one examined is not put back. Then :

A consignment of 15 record players contain 4 defectives. The record players are selected at random, one by one and examined. The one examined is not put back. Then : Find the Probability that 9^(th) one examined is the last defective is (8)/(195) .

A consignment of 15 record players contains 4 defective. The record players are selected at random one by one and examined. The ones examined are not placed back. What is the probability that the 9^(th) one examined is the last defective.

A packet of 10 CD's contains 4 defected.The CDl's are selected at random one by one, examined and are not replaced.The probability that 7 th CD is the last defective is

A lot of 100 watches is known to have 10 defective watches. If 8 watches are selected (one by one with replacement) at random, then what is the probability that there will be atleast one defective watch ?

A lot of 100 watches is known to have 10 defective watches. If 8 watches are selected (one by one with replacement) at random, then what is the probability that there will be atleast one defective watch ?