document.write( "Question 1197425: (a) How many words can be formed using letter of PEPSUDENT using each letter at most once?
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Algebra.Com's Answer #830689 by MathLover1(20849)\"\" \"About 
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i) If each letter must be used\r
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\n" ); document.write( "\n" ); document.write( "\"PEPSUDENT\" has \"9\" letters, \"2\" P, \"2\" E, \"1\" S, \"1+\"U,\"+1+\"D, \"1\" N, and \"1\"T\r
\n" ); document.write( "\n" ); document.write( " there are \"7\" distinct letters to use, and if each letter must be used ones \r
\n" ); document.write( "\n" ); document.write( "that is \"\"7\" Position \"7\"\" or \r
\n" ); document.write( "\n" ); document.write( "\"7P7+=+7%2A6%2A5%2A4%2A3%2A2%2A1+=+5040\" ways \r
\n" ); document.write( "\n" ); document.write( "Here's why that formula works:\r
\n" ); document.write( "\n" ); document.write( "Choose the 1st letter any of the \"7+\"ways.
\n" ); document.write( "Choose the 2nd letter any of the remaining \"6+\"ways.
\n" ); document.write( "Choose the 3rd letter any of the remaining \"5\" ways.
\n" ); document.write( "Choose the 4th letter any of the remaining \"4+\"ways.
\n" ); document.write( "Choose the 5th letter any of the remaining \"3\" ways.
\n" ); document.write( "Choose the 6th letter either of the remaining \"2\" ways.
\n" ); document.write( "Choose the 7th letter only the remaining \"1\" way.\r
\n" ); document.write( "\n" ); document.write( "That's \"7P7+=+7%2A6%2A5%2A4%2A3%2A2%2A1+=+7%21+=+5040\"\r
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\n" ); document.write( "\n" ); document.write( "ii) If some or all the letters may be omitted.\r
\n" ); document.write( "\n" ); document.write( "That's \r
\n" ); document.write( "\n" ); document.write( "\"7P0%2B7P1%2B7P2%2B7P3%2B7P4%2B7P5%2B7P6%2B7P7\"
\n" ); document.write( "or
\n" ); document.write( " \"1%2B7%2B42%2B210%2B840%2B2520%2B5040%2B5040+=+13699\"\r
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