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Posted by **marie** on Monday, August 22, 2011 at 12:45pm.

how many arrangements can be made using four of the letters of the word COMBINE if no letter is to be used more than once?

- math -
**MathMate**, Monday, August 22, 2011 at 4:22pmThe 7 letters of the word "COMBINE" are distinct, so there are 7 choices for the first letter, only 6 for the second, 5 for the third, and 4 for the fourth.

Since the choices are independent, by the rule of multplication, the number of choices is:

7*6*5*4

=?

- math -
**hh**, Tuesday, January 29, 2013 at 1:04am840

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