document.write( "Question 1152555: Find the number of permutations of the numbers 1,2,3 and 4 taken two at a time \n" ); document.write( "
Algebra.Com's Answer #774627 by ikleyn(52781)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "Formulation in your post is  1)  INCORRECT   and   2)  MAKES  no  SENSE.\r
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\n" ); document.write( "\n" ); document.write( "It is because the term  PERMUTATION  never goes in combination  with the words  \"taken two at a time\".\r
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\n" ); document.write( "\n" ); document.write( "In combinations with words  \"taken two at a time\"  goes the term  COMBINATIONS.\r
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\n" ); document.write( "\n" ); document.write( "On Permutations and Combinations, see introductory lessons\r
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\n" ); document.write( "\n" ); document.write( "    - PROOF of the formula on the number of Permutations\r
\n" ); document.write( "\n" ); document.write( "    - Problems on Permutations\r
\n" ); document.write( "\n" ); document.write( "    - Introduction to Combinations\r
\n" ); document.write( "\n" ); document.write( "    - PROOF of the formula on the number of Combinations\r
\n" ); document.write( "\n" ); document.write( "    - Problems on Combinations\r
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\n" ); document.write( "\n" ); document.write( "    - OVERVIEW of lessons on Permutations and Combinations\r
\n" ); document.write( "\n" ); document.write( "in this site.   //   I listed here the \"introductory\" lessons only . . . \r
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\n" ); document.write( "\n" ); document.write( "Also,  you have this free of charge online textbook in ALGEBRA-II in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic  \"Combinatorics: Combinations and permutations\". \r
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\n" ); document.write( "\n" ); document.write( "Save the link to this textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-II
\n" ); document.write( "https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "into your archive and use when it is needed.\r
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