1. 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? In this kind of problem, we can use permutation. nPr = \frac{n!}{(n-r)!} n = 10, r = 4 10P4 = \frac{10!}{(10-4)!} = 5,040 letter words
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The letters are L, O, G, A, R, I, T, H, M, S — a total of 10 distinct letters. Show more…
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