| Each of the 11 letters A, H, I, M, 0, T, U, V, W, X and Y appears same when looked at in a mirror. They are called symmetric letters. Other letters in the alphabet are called asymmetric letters. |
| How many four-letter computer passwords can be formed using only the symmetric letters (no repetition allowed)? |
A) 7920
B) 330
C) 14640
D) 419430
Correct Answer: A
Solution :
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