document.write( "Question 553588: Determine if the problem is a combination or permutation and then find the answer.
\n" ); document.write( "How many ways can a group of 5 people be chosen from a class of 20? \n" ); document.write( "
Algebra.Com's Answer #360955 by AnlytcPhil(1806)\"\" \"About 
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document.write( "The combinations of 20 things taken 5 at a time\r\n" );
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document.write( "That can be written any of the following ways:\r\n" );
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document.write( "\"20 Choose 5\", \r\n" );
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document.write( "C(20,5), \r\n" );
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document.write( "20C5,\r\n" );
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document.write( "C20,5\r\n" );
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document.write( "20C5\r\n" );
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document.write( "20C5\r\n" );
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document.write( "20 nCr 5   <--(The TI-83 or TI-84 notation)\r\n" );
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document.write( "\"%28matrix%282%2C1%2C20%2C5%29%29\" \r\n" );
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document.write( "Answer \"%2820%2A19%2A18%2A17%2A15%29%2F%285%2A4%2A3%2A2%2A1%29\" = \"1860480%2F120\" = 15504\r\n" );
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document.write( "It's 'Combinations' because no pecking order is specified.\r\n" );
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document.write( "[If one had to be president of the group, one vice-president, one secretary,\r\n" );
document.write( "one treasurer, and one business manager, then it would be permutations.  Or if\r\n" );
document.write( "they had to sit in five chairs and it mattered who sat where, it would be\r\n" );
document.write( "permutations.  But order is not important, so it's \"combinations\"].\r\n" );
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document.write( "Edwin
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