document.write( "Question 550823: how many different four digit pin numbers can be made from the digits 2,3,4,5
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Algebra.Com's Answer #359121 by Edwin McCravy(20056)\"\" \"About 
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how many different four digit pin numbers can be made from the digits 2,3,4,5
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document.write( "Are you allowing repetitions of digits in pin numbers like 2335, 2244, or 5555?\r\n" );
document.write( "I'll do it both ways:\r\n" );
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document.write( "A=if the number is less than 3000\r\n" );
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document.write( "If repetitions are allowed,             If repetitions are NOT allowed \r\n" );
document.write( "Choose the 1st digit 1 way, as \"2\".     Choose the 1st digit 1 way, as \"2\".\r\n" );
document.write( "Choose the 2nd digit 4 ways.            Choose the 2nd digit 3 ways.\r\n" );
document.write( "Choose the 3rd digit 4 ways.            Choose the 3rd digit 2 ways.\r\n" );
document.write( "Choose the 4th digit 4 ways.            Choose the 4th digit 1 way.\r\n" );
document.write( "Answer 1×4×4×4 = 64 ways.               Answer 1×3×2×1 = 6 ways. \r\n" );
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\n" ); document.write( "B=if the number must be divisable by 5
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document.write( "If repetitions are allowed,             If repetitions are NOT allowed \r\n" );
document.write( "Choose the 4th digit 1 way, as \"5\".     Choose the 4th digit 1 way, as \"5\".\r\n" );
document.write( "Choose the 1st digit 4 ways.            Choose the 1st digit 3 ways.\r\n" );
document.write( "Choose the 2nd digit 4 ways.            Choose the 2nd digit 2 ways.\r\n" );
document.write( "Choose the 3rd digit 4 ways.            Choose the 3rd digit 1 way.\r\n" );
document.write( "Answer 1×4×4×4 = 64 ways.               Answer 1×3×2×1 = 6 ways.\r\n" );
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document.write( "If repetitions are allowed,             If repetitions are NOT allowed \r\n" );
document.write( "Choose the 4th digit 2 ways, (2 or 4).  Choose the 4th digit 2 ways, (2 or 4).\r\n" );
document.write( "Choose the 1st digit 4 ways.            Choose the 1st digit 3 ways.\r\n" );
document.write( "Choose the 2nd digit 4 ways.            Choose the 2nd digit 2 ways.\r\n" );
document.write( "Choose the 3rd digit 4 ways.            Choose the 3rd digit 1 way.\r\n" );
document.write( "Answer 2×4×4×4 = 128 ways.              Answer 2×3×2×1 = 12 ways.\r\n" );
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document.write( "Edwin
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