Although the inspection system X and the inspection system Y are based on different principles, they can detect all product defects, and they will also mistakenly eliminate 3% of flawless products
Because the cost of error elimination is high, it would save more money by setting two systms at the same time and noly eliminating those which that both systems consider to be defective
Among the products in the same price range, system X and system Y are the inspection systems with least error.