Given A a b c d e B 10 20 30 40 50 and F a function define

Given A = {a, b, c, d, e}, B = {10, 20, 30, 40, 50}, and F a function defined from A to B with F(a) = 50, F(b) = 10, 40, assess the validity of: F is onto. True or False

Solution

The function is not onto as pre images of many points of B including 20,30 is not defined. For the function to be onto,every element of B should possess a pre image in A which is not