# Which of the following relations are functions from A = {1, 4, 9, 16} to B = {–1, 2, –3, –4, 5, 6}? In case of a function, write down its range.( i) $f_1$ = {(1, –1), (4, 2), (9, –3), (16, –4)} (ii) $f_2$ = {(1, –4), (1, –1), (9, –3), (16, 2)}  (iii) $f_3$ = {(4, 2), (1, 2), (9, 2), (16, 2)} (iv) $f_4$ = {(1, 2), (4, 5), (9, –4), (16, 5)}

(ii) $f_2$ is not a function