Question

box contains 15 items,4 of which are defective and 11 are good. Two items are selected. What is probability that the first is good and the second defective?

Answer 1

We have an 11 out of 15 chance, that we can pick a good item, and a 4 out of 15 chance at picking a defect.

By multiplying the two probabilities together, we want to simultaneously pick out two items with order.

Thus, the probability is: 11/15 · 4/15 = 44/225

Answer 2

Defective 1out of 4
effective 1out of 11
i think