How many 3-letter words with or without meaning, can be formed out of the letters of the word, 'LOGARITHMS', if repetition of letters is not allowed?

How many 3-letter words with or without meaning, can be formed out

1.	How many 3-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.	720
B.	420
C.	None of these
D.	5040
Answer» B. 420