document.write( "Question 1117285: a university assinngs a 4 digit identification code what is the proabality that code doesn't contains 7? \n" ); document.write( "

Algebra.Com's Answer #732321 by ikleyn(52780) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "

\r\n" );
document.write( "Since otherwise is not stated, I will assume that all 10 digits from 0 to 9 are allowed for all positions and repeating of digits is allowed.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Then the total number of all possible codes is equal to    (each of ten digits is allowed in each of 4 positions).\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "The number of codes that do not the digit of 7 in any of 4 positions is    (9 digits in each of 4 positions).\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Therefore the probability under the question is   =  = 0.6561 = 65.61%.\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( "Solved.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );