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A survey of 1310 workers in a plant indicated that 900 owned houses, 820 owned cars, 495 owned boats, 550 owned cars and houses, 400 owned houses and boats, 340 owned cars and boats, and 300 owned all three.

(a) How many of the workers did not own any of the three items?

(b) How many of the workers owned only two of the items?

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