document.write( "Question 857969: How many positive integers less than 6000 may be written down without using the digits 6,7,8,9 and 0?\r
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Algebra.Com's Answer #517022 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "We can only use the digits 1,2,3,4, and 5\r\n" );
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document.write( "Number of 1-digit positive integers:\r\n" );
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document.write( "Pick the digit any 5 ways\r\n" );
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document.write( "That's 5 1-digit positive integers\r\n" );
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document.write( "Number of 2-digit positive integers:\r\n" );
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document.write( "Pick the first digit any of 5 ways.\r\n" );
document.write( "Pick the second digit any of 5 ways.\r\n" );
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document.write( "That's 5×5 or 52 2-digit positive integers.\r\n" );
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document.write( "Number of 3-digit positive integers:\r\n" );
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document.write( "Pick the first digit any of 5 ways.\r\n" );
document.write( "Pick the second digit any of 5 ways.\r\n" );
document.write( "Pick the third digit any of 5 ways\r\n" );
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document.write( "That's 5×5×5 or 53 3-digit positive integers.\r\n" );
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document.write( "Number of 4-digit positive integers:\r\n" );
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document.write( "Pick the first digit any of 5 ways.\r\n" );
document.write( "Pick the second digit any of 5 ways.\r\n" );
document.write( "Pick the third digit any of 5 ways.\r\n" );
document.write( "Pick the fourth digit any of 5 ways\r\n" );
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document.write( "That's 5×5×5×5 or 54 4-digit positive integers.\r\n" );
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document.write( "---------------------\r\n" );
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document.write( "Total = 5+52+53+54 = 5+25+125+625=780\r\n" );
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document.write( "Edwin
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