Take any three of the ten natural numbers 1 and 2.10, then the largest of the three numbers is the probability of 3 When I figure it out, it's 1 / 20, but the answer is 1 / 120. Which one is right? Thank you

Take any three of the ten natural numbers 1 and 2.10, then the largest of the three numbers is the probability of 3 When I figure it out, it's 1 / 20, but the answer is 1 / 120. Which one is right? Thank you

There are 120 cases in which C (3,10) = 10 * 9 * 8 / (3 * 2 * 1) = 1,2.10
The maximum number of the three numbers is 3, only in the case of 1,2,3
So probability = 1 / 120