document.write( "Question 779176: How many seven-digit telephone number can be formed if the first three digits cannot be 800 and the first digit cannot be 0? \n" ); document.write( "
Algebra.Com's Answer #475244 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! How many seven-digit telephone number can be formed if the first three digits cannot be 800 and the first digit cannot be 0? \n" ); document.write( "---- \n" ); document.write( "1st digit:: 8 ways \n" ); document.write( "2nd digit:: 9 ways \n" ); document.write( "3rd digit:: 9 ways \n" ); document.write( "4th thru 7th:: 10 \n" ); document.write( "------- \n" ); document.write( "Total:: 8*9^2*10^4 = 6480000 numbers \n" ); document.write( "----------------------- \n" ); document.write( "Cheers, \n" ); document.write( "Stan H \n" ); document.write( "=============== \n" ); document.write( " |