How many 4 letter words with or without meaning can be formed out of logarithms?
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How many 4-letter words with or without meaning, can be formed out of the letters of the word, 'LOGARITHMS', if repetition of letters is not allowed ? Required number of words = Number of arrangements of 10 letters, taking 4 at a time = 10P4 = (10 * 9 * 8 * 7) = 5040.
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