If two grade-school children willingly trade their lunches with one another,we can conclude that at least one of them preferred the other's lunch to his own.

Name: If two grade-school children willingly trade their lunches with one another,we can conclude that at least one of them preferred the other's lunch to his own.
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Question

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Either one or both preferred the other's.If only one preferred the other's,then the other must have been indifferent between the two lunches.

If Two Grade-School Children Willingly Trade Their Lunches with One