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Question

How many words, with or without meaning, can be formed using all letters of the word EQUATION, using each letter exactly once?

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Solution

The word EQUATION has exactly 8 letters which all are different.
A number of words that can be formed.

= number of permutations of 8 letters taken all at a time

=P(8,8)=8!

=8×7×6×5×4×3×2×1

=40320

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