Hi, I've been reading up on injection, surjection and bijection, but I haven't been able to find any examples that can help me figure out the solutions for these two:

1. Let A = {1, 2, 3} and B = {a, b, c, d}. Find one surjection from B to A.

2. Is the following injection and surjection (bijection): f: (0,1) -> (1, e), f(x) = e^{x }

Any help is much appreciated