Question

Let f be a function from a set X to Y.Consider the follow. statements
P: For each x belongs to X ,the exist unique y belongs to Y such that f(x)=y
Q:for each y belongs to Y,there exist x belongs to X sucjh that f(x)=y
R:There exist x1.x2 belongs to X such that x1 not equal to x2 and f(x1)=f(x2)
The negation of statement "f is one one and onto" is ?
a)P or not R b)R or not P c)R or not Q d)P and not Q

Answer 1

@ganeshie8