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The Capital English alphabet has 11 symmetric letters that appear the same when looked at in a mirror. These letters are A, H, I, M, O, T, U, V, W, X, and Y. How many symmetric three letters passwords can be formed using these letters?

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There are 11 symmetric letters.

∴ Number of 3 Letter passwords = 11P3

= 11 x 10 x 9

 = 990

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