Tech Mahindra Associate interview questions

There's three bags of marbles. One back contains black, one contains white and one contains black AND white. Each bag is labelled INCORRECTLY. You are to label the bags correctly by only drawing one marble from one bag. Which bag do you draw from?

Step by step method with team leader. They will ask a series of questions to be implemented.but you have to be precise and to the point. We have to follow up with the people.