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In a survey of 1000 persons it was found that 720 smoke,600 drink,560 chew,380 drink and smoke,270 drink and chew,350 smoke and chew?

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  • In a survey of 1000 persons it was found that 720 smoke,600 drink,560 chew,380 drink and smoke,270 drink and chew,350 smoke and chew?


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