(i). f is injective
(ii). f is bijective
(iii) f is surjective
1b. Suppose there are 11 pigeons sitting in some pigeonhole. If there are only 10 pigeonholes prove that there is a hole containing more than one pigeon.
I just dont know where to begin with the proof and how to show this.
A Complete, Neat and Step-by-step Solution is provided in the attached file.