If $N\to N$ is defined by $f\left(n\right)=n-(-1{)}^n$ , then

Q. If $N\to N$ is defined by $f\left(n\right)=n-(-1{)}^n$ , then

Q.

$iff:N\to Nisdefinedbyf\left(n\right)=n-(-1{)}^n,then$

Q. Let $f:R\to R$ be defined be $f\left(x\right)=x^4,$ then

Q. Let $f:R\to R$ be defined as $f\left(x\right):x^4,$ Choose the correct answer.
(A) $f$ is one-one onto
(B) $f$ is many-one onto
(C) $f$ is one-one but not onto
(D) $f$ is neither one-one nor onto.

Q. A function f from the set of natural numbers to integers defined by f(n)=$\{\begin{array}{cc}\frac{n-1}{2},& \text{where n is odd}\\ -\frac{n}{2},& \text{where n is even}\end{array}$ is