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Que. Let A = {a, b, c, d }, B = { p, q, r, s } denote sets. R : A –> B, R is a function from A to B. Then which of the following relations are not functions ?

(i) { (a, p) (b, q) (c, r) }
(ii) { (a, p) (b, q) (c, s) (d, r) }
(iii) { (a, p) (b, s) (b, r) (c, q) }
a. (i) and (ii) only
b. (ii) and (iii) only
c. (i) and (iii) only
d. None of these
Answer:(i) and (iii) only
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