1) draw the arrow diagram and the matrix representation for the relation: r={(1, 2), (3, 4), (2, 3), (3, 2), (2, 1), (3, 1), (4, 3)} with domain {1, 2, 3, 4)

The arrow diagram and the matrix representation for the relation is shown below.

Step-by-step explanation:

The given relation is

R={(1, 2), (3, 4), (2, 3), (3, 2), (2, 1), (3, 1), (4, 3)}

If a relation is defined as

Then the set of x values is domain and set of y values is range.

The domain of the function is

Domain={1, 2, 3, 4)

The range of the function is

Range={1, 2, 3, 4)

In arrow diagram, we have two sets first set represents the domain and second set represents the range. The arrow connecting the element represent the relation.

In matrix representation,

The arrow diagram and the matrix representation for the relation is shown below.

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any of them that add up to 180 degrees.