Let a be the set of all binary strings of length four. Define a function that maps A to the set {0,1,2,3,4} by leggting f(s) be what you get when you add up the digits making up the string s.

there still no table

answer: i dont know but if you try hard you will get it right : )

step-by-step explanation:

this cant be answered without the graph. you may need to add it.

answer is b.

15

i got this one as well.