document.write( "Question 165369: Suppose you are playing a word game with seven distinct letters. How many seven-letter words can there be? \n" ); document.write( "
Algebra.Com's Answer #121932 by nerdybill(7384)\"\" \"About 
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When \"order\" is important we refer to it as a \"permutation\".
\n" ); document.write( "When \"order\" is NOT important we refer to it as a \"combination\".
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\n" ); document.write( "nPr = (n!)/(n-r)!
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\n" ); document.write( "In our case:
\n" ); document.write( "n = 7
\n" ); document.write( "r = 7
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\n" ); document.write( "nPr = (n!)/(n-r)!
\n" ); document.write( "7_Pr_7 = (7!)/(7-7)!
\n" ); document.write( "7_Pr_7 = (7!)/(0)!
\n" ); document.write( "7_Pr_7 = (7!)/1
\n" ); document.write( "7_Pr_7 = (7!)
\n" ); document.write( "7_Pr_7 = (1*2*3*4*5*7)
\n" ); document.write( "7_Pr_7 = 840\r
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