Here are two methods to make a 3-digit code.
Codes can have repeated digits.
Method A
For the first digit use an odd number between 0 and 10
For the last two digits use a multiple of 11
Method B
Use three digits in the order odd even odd
Do not use the digit zero
How many more codes can be made with method B than with method A?
In your working you must say how many codes can be made with
each method.