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 $$7920.$$
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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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