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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