Question

What is the chance of rolling a 4 with a single dice 3 times

Answer 1

3/18. This is because you roll a 4 3 times, and I'm assuming it's a standard 6 sided die (singular for dice). 3 x 6 = 18 and 3 x 1 = 3. 

Answer 2

The chance of rolling a 4 is 1/6 .

If you already have one, then the chance of rolling another one is 1/6 .

If you already have two, then the chance of rolling another one is 1/6 .

So, starting from the beginning, the chance of rolling three of them
IN THREE TOSSES is

(1/6) x (1/6) x (1/6) = 1/216 = about 0.46 % .

The question actually just says "the chance of rolling a 4 three times".
If you just look at it that way, the chance could be 100% ... it doesn't
say anything about how many tosses you get, and you're just going to
keep rolling that durn cube until you get three 4's.