Answer
Multivalue Problem means If there exist multiple values of an Attribute.Multi column Problem occurs If there exist more than one columns that should be merged into single one.Multi Valued dependency occurs when there exist more than one value of an Attribute against a determinant and the Relation has at least three columns let say there are three columns A ,B ,C
If determinant A has multiple values of B against it , B and C should be Independent From each another then there exist multi valued dependency A->->B.
In the Case of the Relation Student there exist following multi valued dependencies.
StudentNumber ->-> SiblingName
StudentName ->-> SiblingName.
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