Huran co., a food manufacturer, announced a contest for its customers where they could win exciting prizes if they fill in their details in the coupons they find in their cereal boxes and mail them to the company. but at the packaging section of the company, some of the workers forgot to insert the coupons in some of the cereal boxes. this led to numerous complaints from customers. to prevent this problem from happening again, it was suggested that the workers take 10 coupons and 10 boxes before they start packing the boxes, and if any coupon is left after the 10 boxes are packed, the workers recheck the boxes. this is an example of an application of the concept.