Q. 8 A factory has two machines and Past record shows that machine produced of the items of output and machine B produced of the items. Further, of the items produced by machine and produced by machine were defective. All the items are put into one stockpile and then one item is chosen at random from this and is found to be defective. What is the probability that it was produced by machine ?
A : Items produced by machine A
B : Items produced by machine B
X : Produced item found to be defective.
Hence, the probability that defective item was produced by machine =
.