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A survey of 1200 people in a certain city indicates that 840 own microwave ovens, 720 own DVD players, and 600 own microwave ovens and

A survey of 1200 people in a certain city indicates that 840 own microwave ovens, 720 own DVD players, and 600 own microwave ovens and DVD players.

(A) How many people in the survey own either a microwave oven or a DVD player?

(B) How many own neither a microwave oven nor a DVD player?

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