how many 9 digit numbers can be made with 3or 4
What do you mean?
333 333 333 is a nine digit number made or 3s
or
3^3*3*3*3*3*3*3*3**3*3*3*3*3^3= 387 420 489
is a 9 digit number made from 3s
Which do you have in mind?
