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?a. 40b. 400c. 5040d. 2520?
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after the typist writes 12 letters and addresses 12 envelopes, she inserts the letters randomly into the envelopes (1 letter per envelope). what is the probability that exactly 1 letter is inserted in an improper envelope……………
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