document.write( "Question 1193547: A man possesses 24 books, all different. In how many ways can he arrange 12 of them on a shelf? \n" ); document.write( "
Algebra.Com's Answer #825607 by ikleyn(52781)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "The answer and the conception in the post by @Boreal is incorrect.\r
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\n" ); document.write( "\n" ); document.write( "In this problem the order is important, so it asks about PERMUTATIONS, not about combinations.\r
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\n" ); document.write( "\n" ); document.write( "The answer is this huge number\r
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\n" ); document.write( "\n" ); document.write( "             24*23*22*21*20*19*18*17*16*15*14*13 = 1295295050649600.         ANSWER\r
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\n" ); document.write( "\n" ); document.write( "It is the product of 12 consecutive integer numbers in descending order, starting from the number 24.
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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