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? Choose the correct choice from the following choices:
A) 5040
B) 2520
C) 400
D) 40
E) 1502
'LOG5040RITHMS' contains 10 different letters   Required number of words=Number of arrangements of 10 letters taking 4 at a time   =10P4   =10*9*8*7= 
<gadget id="calculator">10*9*8*7</gadget>
<output>5_040</output>
5040   Option 5040
<result>A</result>
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?