Algebra.Com's Answer #664450 by ikleyn(52803)![\"\"](\"/images/stars/stars-13.gif\")  
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document.write( "(1) How many ways can 20 objects be arranged into groups of 5? (order does not matter)\r
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document.write( "(2) A test has five true-false questions that a student does not know how to answer. What is the probability that student will get all five questions to correct?\r
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document.write( "(3) How many ways are there to arrange 5 people in 3 seats?
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document.write( "(1)  =  =  = 15504 ways.\r\n" );
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document.write( " The number of combinations of 20 objects taken 5 at a time.\r\n" );
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document.write( " See the lessons \r\n" );
document.write( " - Introduction to Combinations\r\n" );
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document.write( " - PROOF of the formula on the number of Combinations\r\n" );
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document.write( " - Problems on Combinations\r\n" );
document.write( " in this site.\r\n" );
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document.write( "(2)  =  .\r\n" );
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document.write( "(3) 5*4*3 = 60 ways.\r\n" );
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