determine the number of passwords that can be made from 2 letters followed by 3 digits if no letter or digit can be used more than once

Nina has prepared the following two-column proof below. she is given that ∠oln ≅ ∠lno and she is trying to prove that ol ≅ on. triangle oln, where angle oln is congruent to angle lno nina made two errors in the proof. identify and correct the errors.