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If you know your combination open the top lock turn the change pin on the right side 90 degrees clockwise (looks like a flat head screw; use a coin or paperclip) set number dials to what you want turn back tha change pin 90 degrees counterclockwise close lock new combo is set If not there are tools you can you to crack your shurlok for some brands like Olympus But i'd recomend sending in the lock to allow them to reset it.
10x9x9x9
I'm not sure which master lock you are asking about, but see related links below for methods of opening combination locks
This is not true. Think about any 4 digit multiplied by 1. This remains a 4 digit. In the case of any 4 digit under 5000, multiplied by two would also be a 4 digit number
You are not using the digit zero (0), so there are nine possible digits. If repetition is allowed and order is important (like a 4 digit combination lock), then the answer is 94 = 6561. If repetition is not allowed and order is important, then you have 9! / (9-4)! = 9*8*7*6*5 = 3024.