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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?

Options:
A .  40
B .  400
C .  5040
D .  2520
Answer: Option C

'LOGARITHMS' contains 10 different letters.


Required number of words  = Number of arrangements of 10 letters, taking 4 at a time.


10P4


= (10 x 9 x 8 x 7)


= 5040.


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