document.write( "Question 1193059: There is a box with a padlock You can open the box if you will be able to know the 4-digit code in the padlock. If the first digit of the 4-digit code is 5, how many possible codes are there if the repetition of the digit code is allowed?
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Algebra.Com's Answer #825030 by ikleyn(52784) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "Of 4 possible digit positions, the first position is just occupied by the digit of 5.\r\n" );
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document.write( "Three other positions are free, and we can put any of 10 possible digits from 0 to 9 in any of these 3 positions.\r\n" );
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document.write( "It gives   = 1000 possible digit codes.    ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved (correctly).\r
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\n" ); document.write( "\n" ); document.write( "Ignore answer by @Theo, since it is INCORRECT.\r
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\n" ); document.write( "\n" ); document.write( "I don't know why @Theo decided about 9 digits.\r
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\n" ); document.write( "\n" ); document.write( "Working base 10, we always have 10 possible digits.\r
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