Answer:
It's 6 numbers - if limited to positive integers with no arithmetic functions or repetitions on a ‘normal’ number base 10.
Step-by-step explanation:
First digit can be any one of 3 values (7,8 or 9), second digit any one of 2 remaining values. Thus 3x2=6 values. Allowing negative numbers permits a further 6 3-digit numbers eg - 789, -798, descending thru - 987.
NOTE: WITHOUT REPITITION YAN HA
