Complete the following proof Let f:ABbe a function with finite domain and range. Suppose that|Dom(f)|=nand|Ran(f)|=m. Letf:ABbe a function with finite domain and range. Suppose that|Dom(f)|=nand|Ran(f)|=m. Prove that if f is one to one, then m=n and if f is not one to one, then m f:AB and g:BC. Prove that if f and g are onto function, then gf is onto.Let f:ABandg:BC. Prove that if f and g are onto function, then gf is onto.