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

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

• A

  $$7920$$

• B

  $$330$$

• C

  $$14640$$

• D

  $$419430$$

In English alphabets $$11$$ letters are there which are symmetric.

So, total ways $$=11\times10\times9\times8$$

                        $$=7920$$

Hence, the answer is $$7920.$$

• Correct Answer: A

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• Correct Answer: C

  Solution :

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• Correct Answer: A

  Solution :

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• Correct Answer: C

  Solution :

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• Correct Answer: C

  Solution :

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