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प्रश्न
In how many ways can the letters of the word 'STRANGE' be arranged so that
the vowels never come together?
उत्तर
Total number of words that can be made with the letters of the word STRANGE = 7! = 5040
Number of words in which vowels always come together = 1440
∴ Number of words in which vowels do not come together = 5040\[-\]1440 = 3600
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