document.write( "Question 951664: how many different strings of length 9 can be formed using only the digits {0, 1, 2, 3 }, of the first digit in the string cannot be 0 and the last cannot be 3 \n" ); document.write( "
Algebra.Com's Answer #581259 by Edwin McCravy(20055)\"\" \"About 
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how many different strings of length 9 can be formed using only the digits
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document.write( "Choose the 1st letter any of the 3 ways {1,2,3}, not 0.\r\n" );
document.write( "Choose the 2nd letter any of the 4 ways {0,1,2,3}.\r\n" );
document.write( "Choose the 3rd letter any of the 4 ways {0,1,2,3}.\r\n" );
document.write( "Choose the 4th letter any of the 4 ways {0,1,2,3}.\r\n" );
document.write( "Choose the 5th letter any of the 4 ways {0,1,2,3}.\r\n" );
document.write( "Choose the 6th letter any of the 4 ways {0,1,2,3}.\r\n" );
document.write( "Choose the 7th letter any of the 4 ways {0,1,2,3}.\r\n" );
document.write( "Choose the 8th letter any of the 4 ways {0,1,2,3}.\r\n" );
document.write( "Choose the 9th letter any of the 3 ways {0,1,2}, not 3.\r\n" );
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document.write( "3󫶘󫶘󫶘󫶗 = 3247 = 147456 different strings.\r\n" );
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document.write( "Edwin

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