document.write( "Question 1190905: MAT 145: Topics In Contemporary Math
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Algebra.Com's Answer #822663 by ikleyn(52802) $\"\"$ $\"About$

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document.write( "In this problem, each committee is an ordered quadruple of persons, according to their positions.\r\n" );
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document.write( "Therefore, we apply the formula for PERMUTATIONS.\r\n" );
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document.write( "The number of all possible different committees is  20*19*18*17 = 116280.    ANSWER\r\n" );
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