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

7920

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330

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14640

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419430

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Solution

The correct option is B $7920$
In English alphabets $11$ letters are there which are symmetric.

So, total ways $= 11 \times 10 \times 9 \times 8$

$= 7920$

Hence, the answer is $7920.$

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

The correct option is B 7920In English alphabets 11 letters are there which are symmetric.So, total ways =11×10×9×8 =7920Hence, the answer is 7920.

The correct option is B $7920$
In English alphabets $11$ letters are there which are symmetric.

So, total ways $= 11 \times 10 \times 9 \times 8$

$= 7920$

Hence, the answer is $7920.$