Which of the following relations is a function?

CA Foundation · Quantitative Aptitude · MTP · January 2026
Which of the following relations is a function?
(A) A. R = {(4,6), (3,9), (-11,6), (3,11)}
(B) B. R = {(1,2), (2,4), (2,6), (3,5)}
(C) C. R = {(2,1), (4,3), (6,5), (8,7) (10,9)}
(D) D. R = {(0,1), (1,3), (2,4), (3,1), (3,5)}

Suggested Answer and Working Notes:

Correct Answer: Option (C)

C. R = {(2,1), (4,3), (6,5), (8,7) (10,9)}

Topics: Part-A: Business Mathematics

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