Which set of ordered pairs represents a function from P to Q? P = {5,10,15,20} Q = {-1,1,3}

A){(5,3), (15,1), (5,-1), (15,3)}
B){(15,-1), (15,1), (15,3)}
C){(5,-1), (10,1), (10,3), (15,1), (20,-1)}
D){(15,1), (10,-1), (5,1), (10,3), (15,-1)}
E){(5,-1), (10,1), (15,3), (20,-1)}

Question

Which set of ordered pairs represents a function from P to Q? P = {5,10,15,20} Q = {-1,1,3}

A){(5,3), (15,1), (5,-1), (15,3)}
B){(15,-1), (15,1), (15,3)}
C){(5,-1), (10,1), (10,3), (15,1), (20,-1)}
D){(15,1), (10,-1), (5,1), (10,3), (15,-1)}
E){(5,-1), (10,1), (15,3), (20,-1)}

Quizplus · Accepted Answer

A function from P to Q means each element in set P is associated with exactly one element in set Q. Option E correctly represents a function where each element from P is paired with only one element from Q without any repetition in the P elements.

Which Set of Ordered Pairs Represents a Function from P