<p>Determine whether each of the following functions is a bijectionand explain why.</p><p>(a) f : N → N, defined as <img alt="f(x)=left lfloor x/2 right rfloor." src="https://latex.codecogs.com/gif.latex?f%28x%29%3D%5Cleft%20%5Clfloor%20x/2%20%5Cright%20%5Crfloor." aria-describedby="d3f"/></p><p>(b) f : R