Oh I see, the symbols are repeated a lot.
From what I counted, there are only 25 options out of 99 numbers. Plus the numbers that get the same result..
So,
All numbers from 01 to 09 will always give the same result, the symbol from the number '0'.
All numbers from 10 to 19 will always give the same result, the symbol from the number '9'.
All numbers from 20 to 29 will always give the same result, the symbol from the number '18'.
All numbers from 30 to 39 will always give the same result, the symbol from the number '27'.
All numbers from 40 to 49 will always give the same result, the symbol from the number '36'.
All numbers from 50 to 59 will always give the same result, the symbol from the number '45'.
All numbers from 60 to 69 will always give the same result, the symbol from the number '54'.
All numbers from 70 to 79 will always give the same result, the symbol from the number '63'.
All numbers from 80 to 89 will always give the same result, the symbol from the number '72'.
All numbers from 90 to 95 will always give the same result, the symbol from the number '81'.
Actually, there are only 9 possible options.
So, the trick is that they always shuffle the symbols. But the symbols from the numbers above will always be the same.
Symbol of 9 = Symbol of 18 = Symbol of 27 and so on.
So, there's always only 1 option. It's impossible that he doesn't give you the right answer.