Question: a . Define a function f : { 0 , 1 , 2 , 3 } { 0 , 1 , 2 , 3 }

a. Define a function f:{0,1,2,3}{0,1,2,3} as f(x)=x. Is f onto? Justify your answer with a picture.
b. Now define f:{0,1,2,3}{0,1,2,3} as f(x)=x2mod4. Is f onto? Justify your answer with a picture.
c. And finally define f:{0,1,2,3}{0,1,2,3} as f(x)=(x2-x)mod4. Is f onto? Justify your answer with a picture.
a . Define a function f : { 0 , 1 , 2 , 3 } { 0 ,

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