document.write( "Question 204800: At an annual flower show, 7 different entries are to be arranged in a row. \r
\n" ); document.write( "\n" ); document.write( "a) How many different arrangements of the entries are possible?
\n" ); document.write( "b) If the owners of the 1st, 2nd, and 3rd place entries will be awarded prizes of $100, $50, and $25 respectively, how many ways can the prizes be awarded?
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Algebra.Com's Answer #154580 by edjones(8007)\"\" \"About 
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a)
\n" ); document.write( "nP = n!
\n" ); document.write( "7P = 7!
\n" ); document.write( "=7*6*5*4*3*2
\n" ); document.write( "=5040
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\n" ); document.write( "b)
\n" ); document.write( " nCr = n!/[(n-r)!*r!] because arrangement is not important
\n" ); document.write( "7C3
\n" ); document.write( "= 7!/(7-3)!*3!
\n" ); document.write( " =( 7*6*5*4!)/(4!*3!)
\n" ); document.write( "=(7*6*5)/(3*2)
\n" ); document.write( "=35 ways
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\n" ); document.write( "Ed
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