document.write( "Question 519767: Question: How many ways can 3 students be placed in a row of 5 desk?\r
\n" ); document.write( "\n" ); document.write( "I tried the standard way, like if you had 5 students in 5 desk, you do 5x4x3x2x1, but I didn't get how to do this problem. \n" ); document.write( "
Algebra.Com's Answer #345892 by Maths68(1474)\"\" \"About 
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First Student can be placed = 5 ways
\n" ); document.write( "1 desk is occupied 2nd student can be placed on 4 remaing desks = 4 ways
\n" ); document.write( "2 desks are occupied 3rd student can be placed on 3 remaing desks = 3 ways\r
\n" ); document.write( "\n" ); document.write( "Total Number of ways = 5 * 4 * 3
\n" ); document.write( "Total Number of ways = 60\r
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\n" ); document.write( "\n" ); document.write( "Or\r
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\n" ); document.write( "\n" ); document.write( "Use the formula\r
\n" ); document.write( "\n" ); document.write( "nPr = n!/(n-r)!
\n" ); document.write( "Here we have
\n" ); document.write( "n=5
\n" ); document.write( "r=3
\n" ); document.write( "5P3=5!/(5-3)!
\n" ); document.write( "5P3=5!/(2)!
\n" ); document.write( "5P3=5*4*3*2*1/2*1
\n" ); document.write( "5P3=120/2
\n" ); document.write( "5P3=60 ways.\r
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