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Permutation: n Different Things Taken r at a Time

How many four...

Question

How many four lettered words can be made with the word FLOWER?

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Solution

Number of $4$ letter words
$= 6 P_{4} = \frac{6!}{(6 - 4)!} = \frac{720}{2} = 360$
Since there are no repeating letters.
Number of words $= 360$ .

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Permutation: n Different Things Taken r at a Time

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