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प्रश्न
How many 4 letter words can be formed using letters in the word MADHURI if letters cannot be repeated?
उत्तर
When repetition of letters is not allowed, the number of 4-letter words formed from the letters of the word MADHURI is
∴ 7P4 = `(7!)/((7-4)!)=(7xx6xx5xx4xx3!)/(3!)` = 840
∴ 840 four-letter words can be formed when the repetition of letters is not allowed.
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