document.write( "Question 144475: 36. solve for n
\n" ); document.write( "b) P(n,5)= 20P(n,3)
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Algebra.Com's Answer #105217 by MathLover1(20849)\"\" \"About 
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\"P%28n%2C5%29+=+20P%28n%2C3%29\" \r
\n" ); document.write( "\n" ); document.write( "\"8nPr+5+=+20+%2A+8+nPr+3\" ==> \r
\n" ); document.write( "\n" ); document.write( "\"8nPr+5+=+8%21%2F3%21+=+8+x+7+x+6+x+5+x+4+=+6720\"\r
\n" ); document.write( "\n" ); document.write( "\"8nPr3+=+8+x+7+x+6+=+336\"\r
\n" ); document.write( "\n" ); document.write( " so \"20+%2A+336+=+6720\"\r
\n" ); document.write( "\n" ); document.write( "Therefore, \"8nPr+5+=+20+%2A+8+nPr+3\"\r
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\n" ); document.write( "\n" ); document.write( "\"P%28n%2C5%29+=+20P%28n%2C3%29\" is true when \"n+=+8\"
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