document.write( "Question 67227This question is from textbook Advanced mathematics
\n" ); document.write( ": How many three-digit counting numbers that are less than 300 are there such that all the digits are odd? \n" ); document.write( "
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The only numbers below 300 must be in the one hundreds so the first digit must be 1.
\n" ); document.write( "The second digit can be 1, 3, 5, 7 or 9.
\n" ); document.write( "Five numbers with a second digit of 1 have an odd third digit.
\n" ); document.write( "Five numbers with a second digit of 3 have an odd third digit.
\n" ); document.write( "Five numbers with a second digit of 5 have an odd third digit.
\n" ); document.write( "Five numbers with a second digit of 7 have an odd third digit.
\n" ); document.write( "Five numbers with a second digit of 9 have an odd third digit.\r
\n" ); document.write( "\n" ); document.write( "So the total is 25 numbers.
\n" ); document.write( "111, 113, 115, 117, 119, 131, 133, 135, 137, 139, 151, 153, 155, 157, 159, 171, 173, 175, 177, 179, 191, 193, 195, 197, 199
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