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Find the number of all 4-lettered words ...

Find the number of all 4-lettered words (not necessarily having meaning)that can be formed using the letters of the word BOOKLET.

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We have to 4-lettered words using the letters of the word "BOOKLET".
The word contains 7 letters out of which there are 2O's. So there are 6 letters.`:.` The number of 4 lettered words
`""^7P_4-""^6P_4`=7*6*5*4-6*5*4*3=480.`
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