document.write( "Question 111544: In how many different ways can nine music CDs be arranged on a vertical rack? \n" ); document.write( "

Algebra.Com's Answer #81335 by solver91311(24713) $\"\"$ $\"About$

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Assuming that they are all different CDs, think about it this way:
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\n" ); document.write( "There are 9 ways to pick the first CD, then once you have done that, there are 8 ways to pick the second CD, 7 ways to pick the third one, and so on.
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\n" ); document.write( "So the expression is: $\"9%2A8%2A7%2A6%2A5%2A4%2A3%2A2%2A1\"$ . Mathematicians have a shorthand way to write that sort of expression: 9! (read 9 factorial).
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\n" ); document.write( "I'll let you do the calculator work, or if you have MS Excel on your computer, you can type =fact(9) into a spreadsheet cell and you'll get your answer.
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\n" ); document.write( "Hope that helps,
\n" ); document.write( "John \n" ); document.write( "

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