[" Let "N" be the set of natural numbers...

[" Let "N" be the set of natural numbers and two "],[" functions "f" and "g" be defined as "f,g:N rarr N],[" such that : "f(n)=([(n+1)/(2)],[(n)/(2)]" if "n" is even "],[" and "g(n)=n-(-1)^(n)" .The fog is : "],[" (1) One-one but not onto "],[" (3) Neither one-one nor onto "],[" (4) onto but not one-one "]

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