document.write( "Question 844068: how many ways 20 students can sit in a class of 30 chairs ?
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Algebra.Com's Answer #508507 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "Note: various possibilities
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document.write( "how many ways 20 students can sit in a class of 30 chairs? 
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document.write( "Chairs in row: 
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document.write( "10 empty chairs:  ways of choosing these: 30C10\r
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document.write( "Chairs in a circle: 
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document.write( "ways of arranging 20 students is 19!\r
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document.write( "Chairs random:  30C20 \n" );
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