Question

How many three-digit numbers can you make if you are not allowed to use any other digits except 4 and 9?

Answer 1

8

Explanation:

That total is ...

(number of possibilities in each location)^(number of locations) = 2^3 = 8

The possible numbers are ...

444, 449, 494, 499

944, 949, 994, 999

There are 8 of them.