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There is no such mandatory  Attribute , But if there is such then it is understandable . Say age can be only calculated if date of birth is given . Hence DOB become Mandatory Attribute .

Now a Multivalued Attribute mean you can more than 1 value for an attribute . Assume Phone no is such an example. These days people have multiple PHone Number . Hence it is an Multivalued Attribute  .:)

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