University cafeterias serving students on a full meal plan allow students to go through the serving line

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University cafeterias serving students on a full meal plan allow students to go through the serving line as many times as they wish. It is an all-you-can eat plan. Freshmen typically gain weight their first year under such a plan because they eat until they are full. 

What is the marginal utility of the last serving eaten by a student on a full meal plan? 

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