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The number of words (with or without meaning) that can be formed from all the letters of the word “LETTER” in which vowels never come together is ______.
LETTER: L, E, T, T, E, R. Consonants L, T, T, R: arrange in $\frac{4!}{2!} = 12$ ways. Place 2 E’s in 5 gaps: ${}^5C_2 = 10$. Total $= 12 \times 10 = 120$.
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