Functions Test ...

Consider the following functions are odd function in their default domains
(i) $$\cfrac { { 2 }^{ x }-1 }{ { 2 }^{ x }+1 } $$
(ii) $$\cfrac { { x }^{ 2 }+1 }{ x\sin { x }  } $$
(iii) $$\ln { \left( \cfrac { 1+x }{ 1-x }  \right)  } $$
(iv) $$x{ e }^{ \left| x \right| +\cos { x }  }\quad $$
Which of these is/are odd

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Let $$A$$ be a set of $$4$$ elements and $$B$$ has $$3$$ elements . From the set of all functions from $$A$$ to $$B$$, the probability that it is an onto function is