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7. You have following Relations: Product(maker, model, type) PC(model, speed, ram, hd, price) Laptop(model, speed, ram, hd, screen, price) Printer(model, color, type, price) a. What

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7. You have following Relations: Product(maker, model, type) PC(model, speed, ram, hd, price) Laptop(model, speed, ram, hd, screen, price) Printer(model, color, type, price) a. What PC models have a speed of at least 1000? b. Which manufacturers make laptops with a hard disk of at least one giga-byte? c. Find the model numbers of all color laser printers

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