The mapping diagram in A does not represent a function while the mapping diagram in B represents a function.
What is a Function?
A mapping diagram that is a function would have each of the domain values assigned to exactly one range value. This means, one domain value cannot be assigned to two different range values.
Mapping diagram in A is not a does not represent a function because domain value 1, is assigned to two range values.
The mapping diagram in B is a function because every domain value is assigned to exactly one range value.
In summary, the mapping diagram in A does not represent a function while the mapping diagram in B represents a function.
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