document.write( "Question 166200: how many3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?
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Algebra.Com's Answer #122499 by edjones(8007)\"\" \"About 
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9P3=9!/(9-3)!=9*8*7*6!/6!=504 \n" ); document.write( "
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