Posted by marie on Monday, August 22, 2011 at 12:45pm.
use the formula nPr to solve
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 4:22pm
The 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 1:04am
840
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