There are boxes arriving to a shop, that each contains 30 pieces of items to be sold. the boxes are checked by selecting 3 item from each of the boxes and inspecting these item for damages. it is agreed with the manufacturer that if they can find one or more damaged items from a box, the whole box can be returned to the manufacturer free of charge, otherwise the whole box is accepted. let us persume that there are 4 damaged items in a box. find the propability for the event "box is accepted". find also the propability that the whole box is returned to the manufacturer.