In the name of ALLAH, the most beneficient, the most merciful

Discrete Mathematics (MTH202)

Question (select most suitable option)

  For the following relation to be a function, x can not be what values?
R = {(2,4), (x,1), (4,2), (5,6)}
x cannot be 2, 4 or 5
x cannot be 4, 1 or 6
x cannot be 2, 4 or 6
x cannot be 1, 2 or 6