1st code: Odd number, last digit 6 or 9, tens digit two less the ones digit, hundreds digit 4 less than tenths digit. 2nd code: Odd number ones 4 or 7, tens digit two less than ones, hundreds digit three less than tens. 3rd code: Odd, ones 2 or 9, tens place 3 less, hundreds 2 digit less.
Hi.
