very difficult to get 4 numbers correctly, I've often tried this game but never get a win. gamble is base on luck can't be calculated by percentage 
Yeah that's what I was referring to earlier.
Hence why in my opinion its a waste paying $2 trying to win the lottery which is 6 numbers and its impossible to guess those correctly, even with multiple tickets.
Getting 4 numbers correctly is very difficult also. Most people I know that played the state lottery maybe won once or twice getting 3 numbers.
Hence why you might as well choose your own odds with a regular game of dice.