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प्रश्न
How many words, with or without meaning, can be formed using all the letters of the word EQUATION, using each letter exactly once?
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उत्तर
There are 8 different letters in the word EQUATION.
Number of words formed from these letters (with or without meaning) = `(8!)/((8 - 8)!) = 8!`
= 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1
= 40320
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