Q6 PERMUTATION AND COMBINATION

Each of the 11 letters A, H, I, M. O, T, U, V, W, X and Z appears same when looked at in a mirror. They are called symmetric letters. Other letters in the alphabet are asymmetric letters

How many three-letter computer passwords can be formed (no repetition allowed) with at least one symmetric letter?

3-letter passwords with at least one symmetric letter.
Total number of cases- cases where there are no symmetric letters