Instructions

Directions for the next two questions: Answer the questions based on the following information.

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.

Question 3

How many four-letter computer passwords can be formed using only the symmetric letters (no repetition allowed)?

Solution

The number of ways in which this can be done is 11*10*9*8 = 7920

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How many four-letter computer passwords can be formed using only the symmetric letters (no repetition allowed)?

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