Answer:
0.14% probability of a person guessing the right combination
Step-by-step explanation:
A probability is the number of desired outcomes divided by the number of total outcomes.
The order in which the numbers are selected is important. For example, 1,3,2 is a different combination than 3,1,2. So we use the permutations formula to solve this question.
Permutations formula:
The number of possible permutations of x elements from a set of n elements is given by the following formula:

Desired outcomes:
One right combination, so 
Total outcomes:
10 numbers from a set of 3. So

What is the probability of a person guessing the right combination?

0.14% probability of a person guessing the right combination
The answer would be:
200,000 + 8,000 + 500 + 60 + 1
Direction: Opens UpVertex: <span><span>(−<span>32</span>,−<span>174</span>)</span><span>(-<span>32</span>,-<span>174</span>)</span></span>Focus: <span><span>(−<span>32</span>,−4)</span><span>(-<span>32</span>,-4)</span></span>Axis of Symmetry: <span><span>x=−<span>32</span></span><span>x=-<span>32</span></span></span>Directrix: <span>y=−<span><span>92</span></span></span>
The die can land in 6 different ways.
Only one of them is a 2.
So the probability of rolling a 2 on any roll is 1/6 .
In a large number of rolls, you expect roughly 1/6 of them to be a 2.
In 108 rolls, you should expect a 2 somewhere around
(108/6) = 18 times.