Assertion $\left(A\right):$ If $f:N\to N$ where $f\left(x\right)=x-{(-1)}^x$ then $f$ is bijection
Reason $\left(R\right):$ A function $f$ is bijection if $f$ is one–one and onto
 

A is false but R is true

A is true but R is false

Both A and R are true and R is correct explanation of A

Both A and R are true But R is NOT the correct explanation of A