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Which of these relations is NOT a function?
A. R = {(0, 0), (2, 6), (-4, -12), (-5, -15)}
B. R = {(4, 5), (4,8), (5, 10), (6, 12)}
C. R = {(2, 3), (4,3), (6, 3), (5,3)}
D. R = {(-2, 2), (2,-2), (-4, 4), (4, - 4)}

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dylanjson
C. If the 2nd number in the parenthesis is repeated in multiple samples then it is not a function

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