Let E = {1,2,3,4} and F = {1,2}. Then the number of onto functions from E to F, is ________.

From E to F, we can define, in all, 2 x 2 x 2 x 2 = 16 functions (2 options for each element of E) out of which 2 are into, when all the elements of E either map to 1 or to 2. Therefore, Number of onto functions = 16 - 2 = 14